If you're struggling to know how/who/what to complain, with inspiration from Alex, I've made it a little bit easier for you...
Use this page to generate a letter to send to your MP in just 2 mouse clicks;
http://www.dephormation.org.uk/letters/
All you need is an envelope and a stamp (not supplied!).
Otherwise, a good place to look for the essential information is the
inphormationdesk.org
Pete