0:00:02 > 0:00:04In Mapman I test historical maps.
0:00:04 > 0:00:07Can they take me over landscapes like this -
0:00:07 > 0:00:09the wildest and most beautiful in Britain?
0:00:19 > 0:00:24Here in Scotland you get a sense for how savage geography can be.
0:00:24 > 0:00:28In the last ice age, these mountains were covered in glaciers.
0:00:28 > 0:00:31Around 11,000 years ago, when the ice melted,
0:00:31 > 0:00:35the valleys were filled with water and deep, black lakes.
0:00:37 > 0:00:41The people who lived among these mountains were tough
0:00:41 > 0:00:46and a source of fear to those living in the warmer, richer south.
0:00:46 > 0:00:52The Highlands were an unmapped void of sucking bogs, of tempests, and warlike clans.
0:00:55 > 0:00:59To impose control, what you need is a good map.
0:00:59 > 0:01:02So, in 1746, after the Battle Of Culloden,
0:01:02 > 0:01:08the British Army commissioned one. And they gave a young man of 21, William Roy, the job.
0:01:08 > 0:01:11Over the next few days,
0:01:11 > 0:01:14I'll take a journey of over 100 miles across this map.
0:01:14 > 0:01:20I'll be climbing a 2,000ft pass through the wild, rebellious heartland of 18th-century Scotland.
0:01:20 > 0:01:24I'll discover just how Roy conducted his survey
0:01:24 > 0:01:28and how much of the landscape he mapped can be seen today.
0:02:01 > 0:02:05William Roy took nine years to produce a range of maps
0:02:05 > 0:02:09detailing the geography of Scotland for hundreds of miles.
0:02:09 > 0:02:12Packed with information, beautiful to look at,
0:02:12 > 0:02:16they combine brilliant surveying and delicate water-colouring.
0:02:17 > 0:02:21Roy began his work with the Highlands.
0:02:21 > 0:02:25These maps were so successful, he went on to survey all of Scotland.
0:02:25 > 0:02:30But two mysteries surround him. Who exactly was William Roy?
0:02:30 > 0:02:35And why have some of the roads he mapped completely disappeared?
0:02:37 > 0:02:42I'm going to discover just how William Roy constructed his map.
0:02:42 > 0:02:45How much of his geography can be seen today?
0:02:45 > 0:02:51I'll follow a route Roy took, along Loch Ness and the terrifying Corrieyairick Pass to Loch Rannoch.
0:02:51 > 0:02:56It's one of the wettest, coldest parts of the British Isles.
0:02:56 > 0:03:00But it's a very good example of what Roy had to deal with.
0:03:02 > 0:03:07Roy made his headquarters in one of the forts on Loch Ness.
0:03:07 > 0:03:11And so I'm starting my journey at Fort George.
0:03:11 > 0:03:13DRUMS BEAT MILITARY RHYTHM
0:03:21 > 0:03:25Roy, as a man, remains a mystery,
0:03:25 > 0:03:28but we do know a bit about his surveying.
0:03:28 > 0:03:31A letter describes him working
0:03:31 > 0:03:36with a non-commissioned officer and six soldiers. I'll do the same.
0:03:36 > 0:03:42I'm joined by soldiers from D-company of the First Royal Irish Regiment,
0:03:42 > 0:03:45based at Fort George. I'll do my own mini survey,
0:03:45 > 0:03:47using Roy's methods and equipment -
0:03:47 > 0:03:51two flags, a compass, and a chain.
0:03:52 > 0:03:57The task I've given myself is to map a bend in a road Roy surveyed.
0:03:57 > 0:03:59What Roy did was very simple.
0:03:59 > 0:04:02He took two measurements.
0:04:02 > 0:04:05The angle between the road and north
0:04:05 > 0:04:08and the distance from him to the bend.
0:04:08 > 0:04:13The first thing to do is to place a flag on that bend.
0:04:13 > 0:04:16William Roy's military survey could not have been done
0:04:16 > 0:04:23without this device - a compass. The wonderful thing is, its needle always points to magnetic north.
0:04:23 > 0:04:30So here we are, standing here. We'll wait until the needle settles and I can see magnetic north is down here.
0:04:30 > 0:04:33So I start at the point I'm standing with a table.
0:04:33 > 0:04:38'I just line up the sights on my compass with the flag...'
0:04:38 > 0:04:43And the angle that I measure is this one here - 130 degrees.
0:04:43 > 0:04:48'Right, now the next job is to measure the distance to the bend.
0:04:48 > 0:04:53'For that, Roy used a chain. But the chain doesn't reach the flag.'
0:04:53 > 0:04:55So we need the second flag.
0:04:55 > 0:05:01'So I've got to put a flag midway, line it up, and measure to that.'
0:05:04 > 0:05:09'So, having got the distance to the halfway flag,
0:05:09 > 0:05:15'the soldiers need to leapfrog on with the chain and measure between.'
0:05:15 > 0:05:20You can hardly make yourself heard. The face freezes in the cold.
0:05:20 > 0:05:24- 50 metres to the bend.- 50 metres. Let's write that down.
0:05:24 > 0:05:28It's what William Roy would have done in circumstances like this.
0:05:28 > 0:05:32Each time the road changes direction,
0:05:32 > 0:05:35I mark it onto my sketch map
0:05:35 > 0:05:39and then carry the table and compass and do the same again. It's simple.
0:05:39 > 0:05:43Compass, bearing, measurement. Compass, bearing, measurement.
0:05:43 > 0:05:47Time and again. Thousands of times until the Highlands were mapped,
0:05:47 > 0:05:51using this little device here and an old metal chain.
0:06:03 > 0:06:07Key to Roy's map are the military roads built by General Wade
0:06:07 > 0:06:10about 20 years before Roy started his work.
0:06:10 > 0:06:12They provided a framework
0:06:12 > 0:06:16on which Roy could hang the other features of his survey.
0:06:21 > 0:06:26This is General Wade's military road along the south side of Loch Ness.
0:06:26 > 0:06:29In the 1740s, this was the front line.
0:06:29 > 0:06:34On this side - the army, generals, infantry, Scots loyal to the King.
0:06:34 > 0:06:39On that side - the wild country, mountains, moors, and the rebels.
0:06:43 > 0:06:46I want to find out how on Earth they built this road.
0:06:46 > 0:06:52These brush strokes suggest there was sheer rock to the waterline,
0:06:52 > 0:06:55which the road had to cut through.
0:06:55 > 0:06:59Graeme Ambrose, who's lived on the road for three years,
0:06:59 > 0:07:01knows all about how it was done.
0:07:01 > 0:07:05I'd read about this section called the black rock -
0:07:05 > 0:07:08wonderfully descriptive pieces on it
0:07:08 > 0:07:12about soldiers hanging down on ropes over the precipice,
0:07:12 > 0:07:15over the water, and planting gunpowder
0:07:15 > 0:07:17to blow this road.
0:07:17 > 0:07:20I'm glad I've brought the umbrella!
0:07:20 > 0:07:23Probably the best time to see it, Graeme.
0:07:23 > 0:07:27It's dark and the rock does look bleak and sombre indeed.
0:07:27 > 0:07:34You get a sense of what an achievement it was to build this road above a black rock like this.
0:07:34 > 0:07:36- It's absolutely towering.- Yes.
0:07:36 > 0:07:42So imagine William Roy standing on the top, looking across Loch Ness,
0:07:42 > 0:07:47- with his sketchbook, mapping.- In this wilderness, which it was then.
0:07:47 > 0:07:52- One of the most dramatic points on the road network.- Definitely.
0:07:52 > 0:07:58What they did here, at the time, 2,000 yards of rock like this. Incredible achievement.
0:08:13 > 0:08:20Like the military roads, William Roy's map was to be a new weapon in any future guerrilla war.
0:08:20 > 0:08:24Previous maps of the Highlands had been largely guesswork
0:08:24 > 0:08:28and that had allowed the rebels to flee into the hills,
0:08:28 > 0:08:30confident no-one would follow them.
0:08:30 > 0:08:35But Roy's map would provide the vital information the army needed.
0:08:36 > 0:08:41In today's military language, what a soldier's interested in are the "goings" -
0:08:41 > 0:08:44where you can go with heavy vehicles, infantry.
0:08:44 > 0:08:49What Roy's military map does very well is show the soldiers' goings.
0:08:49 > 0:08:53For example, the roads are marked here in brown lines.
0:08:53 > 0:08:56The buildings are marked in red.
0:08:56 > 0:09:00If there's a red line around a building on the map,
0:09:00 > 0:09:05that means there's a stone wall, so it's a better defensive position.
0:09:05 > 0:09:08But this is also a map of no-go areas.
0:09:08 > 0:09:13The marshes and bogs on Rannoch Moor are marked with a blue tint,
0:09:13 > 0:09:15to tell you not to go there.
0:09:15 > 0:09:19Soldiers need feeding. So crops are marked with parallel lines,
0:09:19 > 0:09:23tinted with yellow, where you can get food.
0:09:23 > 0:09:28But maps are also incredibly interesting for what they leave off.
0:09:28 > 0:09:31And Roy's military maps leave off
0:09:31 > 0:09:34the single most important symbol of Highland culture -
0:09:34 > 0:09:39the clan territories. This is Scotland as a dominion of Britain.
0:09:39 > 0:09:42This is a victor's map - a map of suppression.
0:09:45 > 0:09:51Well, this is my last bit of luxury before the really hard work begins.
0:09:52 > 0:09:58Tomorrow I'm embarking on two days of gruelling walking through the terrifying Corrieyairick Pass,
0:09:58 > 0:10:01all 2,500ft of it.
0:10:01 > 0:10:06One writer in the 1700s said that it made him fear for his life,
0:10:06 > 0:10:11so strong was the blast, so hard the rain, so very thick the mist.
0:10:11 > 0:10:13As for the cold, it stupefied him.
0:10:13 > 0:10:16But if Roy got through, I've got to.
0:10:30 > 0:10:37For the British, no other place better symbolised guerrilla war than the Corrieyairick Pass.
0:10:37 > 0:10:40When General Wade was building his road through it,
0:10:40 > 0:10:45boulders as big as cannons were rolled down the hill at his workers.
0:10:45 > 0:10:49And overnight, the course of a stream could mysteriously change
0:10:49 > 0:10:53so that it flowed across the new road and washed it away.
0:10:53 > 0:10:57William Roy would have been in similar danger,
0:10:57 > 0:11:01but still surveyed every metre - whatever the weather.
0:11:02 > 0:11:05The winds get up to 70mph here.
0:11:05 > 0:11:09I've got about 16 miles walking ahead of me
0:11:09 > 0:11:15and already it's remarkable how much of what Roy mapped I'm finding.
0:11:15 > 0:11:20There is no key on William Roy's map to explain the symbols used.
0:11:20 > 0:11:24On the Corrieyairick Pass, there are two strange circles marked.
0:11:24 > 0:11:27One here, and another here.
0:11:27 > 0:11:32At first I thought they were wells or springs for them to get water.
0:11:32 > 0:11:38Now I think they're something else because there's no water or well.
0:11:38 > 0:11:41I think they're actually vantage points.
0:11:41 > 0:11:46Those circles represent a place where a soldier with a telescope
0:11:46 > 0:11:50can watch the pass for any movement below and to plan an ambush.
0:11:55 > 0:11:59There are endless hiding places up here.
0:11:59 > 0:12:04It was ideal for concealed attack on a passing column of Redcoats.
0:12:07 > 0:12:11And THAT'S what Bonnie Prince Charlie was thinking
0:12:11 > 0:12:16when he marched troops up here in August 1745 to lie in wait.
0:12:19 > 0:12:23But something spooked the British and they never showed.
0:12:39 > 0:12:43Military roads were usually built on the Roman principle -
0:12:43 > 0:12:47dead straight, cutting right through the landscape.
0:12:47 > 0:12:52But Roy's map suggests some builders had to abandon military principles
0:12:52 > 0:12:55and go with the geography.
0:12:55 > 0:12:59The mountainside is too steep for the road to take a direct course.
0:12:59 > 0:13:04So General Wade constructed a series of spectacular hairpin bends.
0:13:04 > 0:13:08For 100 years, this was the highest public road in Britain.
0:13:08 > 0:13:12On William Roy's map the hairpins show up as dramatic zigzags.
0:13:13 > 0:13:20They seem to have been drawn in a hurry. Perhaps Roy wasn't too keen on hanging around here.
0:13:20 > 0:13:24His location for the zigzags is incredibly accurate.
0:13:24 > 0:13:29The OS has the zigzags at 57 degrees north, four degrees west.
0:13:29 > 0:13:33That means Roy was less than 1km out.
0:13:33 > 0:13:35Amazing surveying for the 1700s.
0:13:47 > 0:13:50The weather's closing in.
0:13:50 > 0:13:55You don't have to spend many hours in the Highlands to realise
0:13:55 > 0:13:59this is an incredibly exposed slab of the Earth's crust.
0:14:17 > 0:14:24Corrieyairick is the closest Britain comes to an Alpine pass. And up at 2,000ft, it's freezing.
0:14:31 > 0:14:38There are several bridges that were built by General Wade when he put the military road over the top.
0:14:38 > 0:14:41But only one is named on William Roy's map.
0:14:41 > 0:14:44And he calls it Snugburrow Bridge.
0:14:44 > 0:14:49Well, what does Snugburrow mean? I've been looking around beside me
0:14:49 > 0:14:54for snug burrows, somewhere you can snuggle out of the wind and shelter.
0:14:54 > 0:14:58I think that's what snugburrow means. It's a military bivouac site.
0:14:58 > 0:15:05I'm quite sure William Roy used the site because he had to shelter from this appalling weather as well.
0:15:05 > 0:15:10Anyway, I think I've found the bivouac site. Let's look down here.
0:15:10 > 0:15:14The only place I can find that's sheltered from the wind
0:15:14 > 0:15:18and underneath the bridge parapet, quite steep...
0:15:21 > 0:15:25The amazing thing is, that stone is bone dry.
0:15:25 > 0:15:30Down here, three or four men could lie between rows of moss-covered stones,
0:15:30 > 0:15:35completely sheltered from the wind blasting overhead and the rain too.
0:15:35 > 0:15:40This little bivouac site, here, is a wonderful example
0:15:40 > 0:15:44of how a place name on a map can act as a window on old geographies.
0:15:49 > 0:15:54This is where Roy's job must have been really tough. It's cold.
0:15:54 > 0:15:58I'm less than halfway across, dusk's falling,
0:15:58 > 0:16:03the road isn't bad, but once it's dark, you lose sense of direction.
0:16:03 > 0:16:06Everything looks the same.
0:16:06 > 0:16:08I'll stop here for the night.
0:16:10 > 0:16:13This is actually a five-star bivouac site.
0:16:13 > 0:16:16And, um...I've spent...
0:16:16 > 0:16:20many months, even years, tramping mountains
0:16:20 > 0:16:23and slept in far worse places than this.
0:16:23 > 0:16:27This is...an absolute beauty. That's my bed for the night.
0:16:27 > 0:16:30There's the doorway.
0:16:30 > 0:16:32It's nice to get out of the weather
0:16:32 > 0:16:36and it's completely windproof and out of the rain.
0:16:36 > 0:16:40And the added bonus that, as I lie in this...
0:16:40 > 0:16:44snug little burrow, I might be lying on the same spot
0:16:44 > 0:16:48William Roy also slept on over 200 years ago.
0:16:48 > 0:16:50I love that - sleeping with ghosts.
0:17:08 > 0:17:15Last night was very wet and very cold but a gale has come over the mountains, ripped the sky apart,
0:17:15 > 0:17:19and I've now got clear blue skies and enormous views.
0:17:19 > 0:17:23I can see for miles. This is what the Highlands are about. I love it!
0:17:36 > 0:17:39Out of the pass. My next stop is Kinloch Rannoch,
0:17:39 > 0:17:43a medium-sized village at the eastern end of Loch Rannoch.
0:17:43 > 0:17:46Apart from the map itself,
0:17:46 > 0:17:49there are hardly any records of Roy's work.
0:17:49 > 0:17:56All his field books have disappeared but there is a painting by the water-colourist Paul Sandby.
0:17:57 > 0:18:02In the late 1740s, Sandby was the chief draughtsman on Roy's team.
0:18:05 > 0:18:07This is "A View Near Loch Rannoch"
0:18:07 > 0:18:11and was made from a point very near here.
0:18:11 > 0:18:18It shows a surveyor with his compass and soldiers with a measuring chain. Incredibly, it also shows
0:18:18 > 0:18:22an elegantly dressed woman. There were no women on Roy's survey.
0:18:22 > 0:18:25A wife, perhaps? Who knows?
0:18:25 > 0:18:29I want to find where Sandby stood when he made this drawing.
0:18:29 > 0:18:35If I can do that, perhaps I can solve a map mystery that's been puzzling me for ages.
0:18:38 > 0:18:43Could this painting be the crucial missing link in the Roy story?
0:18:44 > 0:18:49Unfortunately, since Sandby's day they've built a reservoir here
0:18:49 > 0:18:54and I suspect that his vantage point may now be under 30ft of water.
0:18:57 > 0:19:01But it's only by going out there that I'm going to find out.
0:19:27 > 0:19:30Ever since I saw this,
0:19:30 > 0:19:35I've been fascinated by the man in the foreground. Is it William Roy?
0:19:35 > 0:19:38If he is, there's no way of knowing
0:19:38 > 0:19:41because part way through the survey,
0:19:41 > 0:19:44Roy's original team was joined by others.
0:19:44 > 0:19:47Then I discovered the painting is dated 1749.
0:19:47 > 0:19:52Well, the other teams didn't join Roy until 1750.
0:19:52 > 0:19:56So this painting shows William Roy's own surveying team
0:19:56 > 0:19:59and the man in the blue coat has to be Roy himself.
0:20:06 > 0:20:10Well, I was wrong about Sandby painting from the reservoir.
0:20:10 > 0:20:12I'd better try again on dry land.
0:20:12 > 0:20:16I've crossed onto the far side of the loch.
0:20:17 > 0:20:24And at last the landscape in Sandby's painting is beginning to match the view across the valley.
0:20:24 > 0:20:30I'm going up a slight rise here onto a bridge and I think this is the spot he used.
0:20:31 > 0:20:33It is. This is it.
0:20:34 > 0:20:37But why here? Why this scene?
0:20:37 > 0:20:42I think the clue lies in the crag in the background of the picture.
0:21:01 > 0:21:03I'm climbing Craigvar.
0:21:03 > 0:21:06This is the peak in the Sandby painting.
0:21:06 > 0:21:11I'm sure William Roy must have come up here. It's perfect for surveying.
0:21:11 > 0:21:15Look at that! What an incredible view!
0:21:15 > 0:21:18You can see EVERY detail in the landscape.
0:21:18 > 0:21:22What a perfect observation platform for a mapmaker!
0:21:40 > 0:21:44And now I can see why Kinloch Rannoch was so important.
0:21:44 > 0:21:49Only about 400 people live here now but, believe it or not, in the 1750s
0:21:49 > 0:21:52the population was over 2,500.
0:21:53 > 0:21:58The government planned to make the village the centre of the Highlands.
0:21:58 > 0:22:03Troops would police the region. To do that, they needed good roads.
0:22:04 > 0:22:10In the 1740s, there was a good military road running north to south through the Highlands.
0:22:10 > 0:22:16But there was nothing west from here to Fort William on the front line.
0:22:16 > 0:22:23All they had to do was push a road along the shore of the loch, towards those distant mountains,
0:22:23 > 0:22:26across the unmapped wilderness of Rannoch Moor.
0:22:26 > 0:22:29And that is where I'm going next.
0:22:29 > 0:22:34But I think it's going to have to wait until tomorrow.
0:22:49 > 0:22:51Last day of my hike.
0:22:51 > 0:22:55We know that the army planned a route across Rannoch Moor
0:22:55 > 0:22:59and Roy's map shows the road heading westwards from Loch Rannoch.
0:22:59 > 0:23:05But there's a mystery. Roy's road finishes at the edge of his map, just before the moor.
0:23:05 > 0:23:08The question is, why?
0:23:09 > 0:23:12I want to walk along the road on Roy's map,
0:23:12 > 0:23:15so I must get across that river.
0:23:17 > 0:23:24To wade across a river in the Highlands, get someone who knows what he's doing, like Charlie Pirie.
0:23:24 > 0:23:29The rivers in this part are fast and dangerous, as winter approaches
0:23:29 > 0:23:32and the water comes down from the hills.
0:23:37 > 0:23:42So, Charlie, how can you tell a good place to cross a river this deep?
0:23:42 > 0:23:45Well, you see the ripple where the rocks are?
0:23:45 > 0:23:49- Yes.- People reckon that if you have the ripple,
0:23:49 > 0:23:53you're actually getting where it's dangerous.
0:23:53 > 0:23:58So we've got a calm bit here. Still quite deep but not so dangerous.
0:23:58 > 0:24:04Tell you what, it's cold! You don't notice, then it's in your bones.
0:24:04 > 0:24:09If you were lying in here, you'd have between nine and 15 minutes.
0:24:09 > 0:24:13- Before you drown? - Before hypothermia comes in.
0:24:13 > 0:24:15Nine or 15 minutes till you're dead.
0:24:15 > 0:24:20You'd maybe get a wee bit more in summertime.
0:24:21 > 0:24:24Charlie's a gamekeeper and runs his own survival courses
0:24:24 > 0:24:27in wild parts of the Highlands.
0:24:27 > 0:24:31When it comes to distinguishing a proper military road on Roy's map
0:24:31 > 0:24:35from a farm track, he ought to know.
0:24:35 > 0:24:39Charlie, this is looking bigger than a shepherd's path.
0:24:39 > 0:24:43Yeah, well, we're in an area here where we've got a big rock.
0:24:43 > 0:24:48They've decided it was too high and I reckon with the shape of that,
0:24:48 > 0:24:54three or four men blasted the top, allowing them on to the next bit.
0:24:54 > 0:24:57If it had been a bulldozer, they'd have taken it.
0:24:57 > 0:25:01- I'm pretty sure that's manmade. - What about this gap?
0:25:01 > 0:25:04Basically, the same thing with that here.
0:25:04 > 0:25:09But it looks, because it's so flat, as though it's been drilled through
0:25:09 > 0:25:13and blasted with black powder, because it's so cut.
0:25:13 > 0:25:19Well, that's fascinating, because William Roy marked a road through the valley we're in now.
0:25:22 > 0:25:26The very fact that so much of Roy's map can be seen on the ground,
0:25:26 > 0:25:31ought to mean we can discover where the military road went
0:25:31 > 0:25:34and why it stopped before reaching Rannoch Moor.
0:25:34 > 0:25:37I'm not sure about this, Charlie.
0:25:37 > 0:25:41The path seems to go down there and there's another up here.
0:25:41 > 0:25:46Well, we can have a look from here. We'll maybe get a better idea higher.
0:25:46 > 0:25:50You can see the lie of the land up here. What does the map say?
0:25:50 > 0:25:54Well, the road on the map...
0:25:55 > 0:25:58..goes across the middle of what's now bog.
0:25:58 > 0:26:03It's gone to bog because it hasn't been drained for years and years.
0:26:05 > 0:26:07Can you feel the old road, Charlie?
0:26:07 > 0:26:11There's no solid borders, where they would have put big boulders on
0:26:11 > 0:26:16to make the base of the road, then put gravel on to it.
0:26:16 > 0:26:19It's soft as anything, out of sight.
0:26:19 > 0:26:22There's been no road on this part, that's for sure.
0:26:22 > 0:26:27Well, the road used to go across here cos it's on the map.
0:26:27 > 0:26:30Certainly no road on that bit.
0:26:30 > 0:26:34- Charlie, we're at the end of the road.- The end of the road.
0:26:34 > 0:26:39I mean, the road's not been there for 100, 200 years.
0:26:39 > 0:26:45- And if it did go through there, you certainly can't get there now. It's waterlogged.- Absolutely.
0:26:45 > 0:26:48It's disappeared into the bog.
0:26:49 > 0:26:56The original military road on Roy's map got as far as Rannoch Moor and no further.
0:26:56 > 0:26:59But today it doesn't even reach that far -
0:26:59 > 0:27:03lost under several feet of peat and water.
0:27:04 > 0:27:09So the road from Rannoch to Fort William wasn't built. In fact, it's never been built.
0:27:09 > 0:27:12There's no road west across Rannoch Moor.
0:27:12 > 0:27:17If you want to go to Fort William, it's a very long, boggy walk,
0:27:17 > 0:27:21or you can sit back and enjoy a spectacular ride on the train.
0:27:28 > 0:27:32William Roy was a visionary. His detailed, measured map of Scotland
0:27:32 > 0:27:39led not only to the mapping of the whole country, but also to the mapping of the British Empire.
0:27:41 > 0:27:46Roy set the pattern for 18th-century surveys of Canada, Bengal,
0:27:46 > 0:27:49and the east coast of North America.
0:27:51 > 0:27:54There's a final twist to William Roy's story.
0:27:54 > 0:27:59The military survey, and the detailed information it contained,
0:27:59 > 0:28:05was so valued it was kept secret for fear it would fall into enemy hands.
0:28:05 > 0:28:10Today, this masterpiece is kept in a vault in the British Library,
0:28:10 > 0:28:13who say that it's their greatest treasure.
0:28:13 > 0:28:16William Roy's great map captured the Highlands,
0:28:16 > 0:28:19but taming them is another thing altogether.
0:28:38 > 0:28:41Subtitles by Laura Jones BBC Broadcast 2004
0:28:41 > 0:28:45E-mail us at subtitling@bbc.co.uk