I think he's mentioned a few times the potential therapeutic benefits of a bivi / getting out there. Seems it might not just be the ramblings of a displaced Derbyshireman, even Radio 4 is catching on to it

http://www.bbc.co.uk/programmes/b0952ph0

(9:30 segment this morning on the positive effects of the outdoors - "Isabel Hardman on nature and depression"]