There are a number of websites which help constituents and interest groups organise mass email campaigns to their MPs. I receive a large number of such email campaigns each week.
I endeavour to respond to all such email campaigns but I always prioritise individual correspondence ahead of such mass mailings. I have decided to put my replies to these campaigns on this site so that other people who may be interested in the issues and my answers to them can keep up to date.
The archive of answers can be read here: Email Campaign Responses.