On 24-Mar-2007, Michelle wrote:

I'm fined, how much is likely in a case like mine? Would it make a
difference if I write how sorry I am and how frightened I've been? Or
should I write nothing?

You should tell them you were in a hurry, you made a really stupid
mistake, and you're very, very, very sorry. Personally I think not
replying is a bad option. Keep it simple, and and don't say too much.

What happens if I don't send the letter back?
Also someone here...

....that would be me.

said if I get a criminal record for this it'll last
for 5 years, is this true I thought it was for life?

It's a thing called the "Rehabilitation of Offenders Act 1974"

Read about it he http://www.lawontheweb.co.uk/rehabact.htm

I honestly don't
know what to do anymore. I feel so stupid for being in a rush that day
and not thinking things through. I think someone suggested I seek help
from a solicitor, how do I go about this? Sorry I have no idea how
this works.

As the others have said, CAB, Yellow Pages.

You're not going to prison, take it easy.