Hi and BIG thanks to everyone for their posts.
ForestNymph: Used your letter info and got this in reply (this is the relevant bit, or too much typing lol).
.....following investigations we have concluded that the debt is not linked to you. As such we have removed your personal details from our data base.
"We would recommend that you contact the credit reference bureau to review your credit history, as your address was identified following a search of these."
So a good result , thanks again