Call your solicitor and ask them. They should have a solicitor's "Yellow Pages" and be able to give you a list of solicitors in the Essex area.
Then phone around these and explain your situation and get someone who specialises in traffic. They may even recommend someone else.
A good solicitor with local knowledge will be able to give you a reasonable estimate of what to expect.
Wasn't Mr Butters was it Paul?
[Edited on 21-4-2004 by antonye]