Griff follows the mighty Severn and its neighbour, the Wye, from their sources in Wales.
Griff travels upstream from Kinlochleven into one of the most remote areas of Scotland.
Griff Rhys Jones finds a Spirit Yacht which he thinks would be perfect for the parade.
Terry Wogan explores the extraordinarily long career of his literary hero, PG Wodehouse.
Griff Rhys Jones, Rory McGrath and Dara O Briain are thrown into Gondola practice.
Griff Rhys Jones, Rory McGrath and Dara O Briain explore the Adriatic, heading to Venice.
Griff and George reflect on George's first job as an architectural designer.
Across the lane there is trouble at t'mill, as Griff's plans meet local objections.
Rob Brydon explores Welsh identity and creates a stand-up routine of Welsh-based material.