There is no law exactly that will prevent the collection agency from sending you a letter.

I would not respond to the letter, as it is fishing with the hopes that SOME will respond to its efforts and it will make money. Speaking to the collection agency only encourages it to harass you and wear you down. The company cannot now take you to court and successfully sue you, BUT that does not prevent them trying. So, be vigilant.

Sometimes a debt is wiped after a certain amount of years. However if you renegotiate you make the debt live again. Under no circumstance answer their letter. This happens in Bankruptcy circumstances. One renegotiation and it all starts again.

You are correct that the car would have been sold to recover some of the debt., and I would assume that if this debt recovery agency had any authenticity they would have supplied a breakdown of what had been paid and accrued.

Wait for them to try and take you to court. There are to Signatories and it is over a decade ago. A judge would not be too sympathetic with them.

Have just double checked my advice and I am right. If you have not agreed to the debt in the last years then the "Limitations act 1980" means they can not chase you down. Ignore them completely.

Both answers were similar and very helpful but this answer goes into more detail.

Thank you very much and I do hope you avoid these people.