If a creditor catches up with you or makes any kind of fuck up send them a letter telling them that you dispute the debt.
Send them a one pound postal order requesting a copy of the original signed consumer credit agreement giving them 14 days to produce it. Don't worry about the actual law's name or anything just use the expression 'relevant legislation'.
If they can't or won't the debt is unenforceable. If they continue to make demands without producing the document after an additional 30 days they are committing a criminal offence.
They are also obliged to provide you with a copy of any documentation proving their ownership of the debt and a full statement.
If they go silent wait until the additional 30 days has expired and send them a letter telling them that as they have failed to comply you consider the matter closed.
Make sure you use the expression 'none of the above / below is an admission of any alledged debt' and make sure you don't go admitting liability by mistake... always use the words '
alledged debt'
Check everything they send you for errors in dates, amounts, addition charges they have added etc. Make sure everything that should be signed is signed and that the conditions of the original agreement have been followed by them.
Some debt collection agencies will try to claim they are not covered by the law because they are not the original lender and they had only bought the rights to the debt not the obligations... It's bullshit but you can play the game by telling them you will take the matter up with the original creditor, the chances are they won't have any documentation at all because they thought the matter was out of their hands.
As long as you can come up with some vaguely credible no matter how pedantic or nit-picking reason to keep the debt in dispute they are highly unlikely to start proceedings against you as they would most likely be struck out.
I've just walked away from a £3500 debt by being an awkward fucker and sticking to my guns. The fucktards are only to quick to use the law against you but they don't like it up 'em