One of the most useful tools for interacting with party politics, on the occasions it becomes necessary, is Write to Them. It always slightly startles me when I see someone encouraging people to write to their MP about an issue and not linking to Write to Them, because it's just so useful. So: a quick summary, to hopefully make it more widely known about.
Enter your postcode (they have advice if your postcode isn't obvious) and you will then be able to contact any of your elected representatives (local councils, devolved administrations, MPs, and European representatives) - advice on which representative deals with what - or any member of the House of Lords.
Essentially it takes all the boring work out of:
- Finding out who your representatives are
- Finding out what party your representatives are
- Finding out how to contact them
- Finding stamps, fax machines, or whatever devices are needed
...leaving much more time to do the necessary hard work of researching the issue and constructing a persuasive message.
Sadly, it can't guarantee a reply (and certainly not a useful one), but most messages are replied to within 2-3 weeks.