John Nettles follows people trying to save endangered orangutans on Jersey and Sumatra. (R)
3/5 The group starts to fragment a little as their personal journeys come to the fore.
Michael Portillo travels from the Swiss Alps to the shores of Lake Geneva.
2/8 Tessa Dunlop tries her hand at a local tradition - cockle picking - at Penclawdd.
2/2 Inside Justice tries to help a Southampton man in prison for the murder of his lover.
1/4 Dominic Sandbrook explores British postwar culture. (R)
1/2 Dr Chris van Tulleken takes over part of a GP surgery to stop patients' prescription pills (R)
4/5 This time, the remaining six volunteers are working in manufacturing. (R)