I don't really like the way MEPs are elected - when I had a complaint about a European law recently I looked up who I should write to and got a list of about 20 people - UKIP, Conservative, Labour, LibDem all represented. I wrote to one of them and didn't get a reply - was I supposed to write to all of them?
That's really poor form of them not to reply. I've only e-mailed my local MEP twice but got a reply both times.
writetothem.com allows you to look up and e-mail all of your MEPs at once. You're probably best off seeing which MEP most closely agrees with your views and who is most likely to take your cause forward in the European parliament (i.e. not UKIP or anyone else who doesn't turn up very often).