I happened to read the article at the link below - the particular lobbying effort has nothing to do with caring (it succeeded in getting an MP to withdraw a Bill about registration plates on motorbikes) but I was especially interested in these comments:

"What really stopped the Bill was the political pressure brought on MPs. A specialist motorcycling paper, Motorcycle News, first broke the story. Then, prompted by my articles in Telegraph Motoring, hundreds if not thousands of readers wrote directly to their MPs expressing their outrage. The average number of letters about the Bill received by an MP was eight. By Parliamentary standards, this is a huge figure, on a par with a major topic of local constituency interest." [My emphasis]

Article at]http://www.telegraph.co.uk/motoring/mai ... fold22.xml[/url]

or]http://tinyurl.com/2w4rpb[/url]