Gareth Malone returns to South Oxhey to catch up with the choirs he created in 2009.
Lorne Spicer helps Sandra Kidd raise the funds to install a log cabin in her back garden.
Martin Roberts and Lucy Alexander visit homes in Cornwall, Hertfordshire and Plymouth.
Tim Wonnacott is joined by experts David Harper and Kate Bliss in Lincoln.
The teams visit Derby, with host Tim Wonnacott and experts Kate Bliss and David Harper.