Declining party membership

This BBC article examines some of the underlying reasons why few people want to be members of political parties and what the main parties in the UK are doing about it. 

http://www.bbc.co.uk/news/uk-politics-12934148

I particularly like the line that “there are more members of the Caravan Club, or the Royal Society for the Protection of Birds, than of all Britain’s political parties put together.” A classic case of effective market segmentation based on the real interests and priorities of people?