Has there been any court action for recovery taken against you??? If not I think this matter could well be time barred providing you have never admitted liability. I know that in Scots law a creditor has to take legal action for recovery of a debt within 5 years (in accordance with the Limitations Act)and I'm sure the law in England is similiar although it could be 7 years.(posted 7014 days ago)You need to read the info on the site but why don't you write to them and advise them that your understanding is that the matter is time barred and ask them to confirm that the matter is closed.
Good luck
Moira