"Outside the political arena (Lord Kennet) was chairman of the Council for the Protection of Rural England; founding secretary of the campaign for the abolition of censorship; a campaigner for listed buildings, which included St Pancras station; a member of the Redundant Churches Fund; a chairman of the Avebury Society; and patron of Action for the River Kennet."*
Lord Kennet was also a staunch opponent of the proposed Bonds Garage housing development at Avebury. See - http://www.heritageaction.org/?page=theheritagejournal&p=2
*More here - http://www.telegraph.co.uk/news/obituaries/politics-obituaries/5309774/Lord-Kennet.html