Just propagating links again, I'm afraid: WriteToThem is a new and extended version of FaxYourMP. Type in your UK postcode and send a letter to any of your elected representatives -- councillors, MPs, MEPs, MSPs or assembly members -- instantly and for free.
This can probably also serve as an explanation for the paucity of posts here lately. And as a substitute for actual content, here's a picture I drew a while ago while trying to understand how the UK's electoral geographies are arranged:
The (marginally) interesting thing to note about that picture is that it is both inaccurate and an oversimplification of the true situation....