Thank you for your reply.
This firm does not come over as being one with a genuine case. i too,sent my first reply to them snail mail and then decided i would back it up with a recoreded delivery copy. Their next letter to me implied I had been ignoring their letters for which I would be punished by the judge in court . It is obviously a tactic they use to continue their intimidation tactics, a game called "lets pretend we haven't heard anything." I will use registered from now on. but what a waste of time!
GOOD LUCK and do let me know if you find out anymore. Even visiting CAB here takes a whole mornings wait.