Oh you have not responded yet?
Did you see the post from "fullefect" it was on page one of this thread.
do a hybird of that letter stating ... well, what letter states. =)

and email them the letter ...
With you being in the UK it seems that you have nothing to worry about (I am not a lawyer, but it looks like UK law actually protects its citizens, wish I could say the same for the good old USA)
Sue or be Sued, its the American way!

I am not too worried about my letter .... best of luck to you and a little skill =)