Just a little help, it certainly helped me TWICE anyway!
Basically when you get the forms through the post with a fine - ignore them. What I mean by this is, fill in the form all correctly, take a photocopy then destroy the original. IF they take it to court you can stand up and explain that you sent the forms off, and that you have photocopies to prove it (they cannot disprove that you didnt send them). They will have no choice but to fine you just the original amount. Someone I know did exactly this.
Anyway, I have done this twice myself, and on both occasions I filled them out, photocopied them/destroyed the originals and ignored them etc. I have never heard a thing - and that was 3 years ago!