Hi --- Agreed.... if this debt is unsecured and no CCJ was ever issued then under the limitations act 1980 you should write recorded delivery, stating you now consider the debt, "statute barred" this applies when old debt has not been acknowledged or paid towards and where no contact has happened for a period of Six years.
I enclose a article with a template letter from the UK Insolvency helpline below, which you will have to copy & paste both bits into your browser to make it work. ?
http://www.insolvencyhelpline.co.uk/debt_factsheets/liability_for_debts_and_the
_limitation_act.htm
The debt will always be there it's just that by law there will be no way of legally enforcing it, or contacting you without risking harrassment charges or recording it on your credit reference.