Sorry - hit the Submit button too early!
I use these people:
https://www.creditexpert.co.uk/ I don't have any debts per se, but their monitoring service is invaluable in today's online fraud climate. E.g. if someone were to carry out identity theft and, say, try to obtain a loan or mortgage in your name, you'd know about it almost instantly. They also show when other institutions have done a credit check on you, which can also be an indication of identity theft. E.g. if your report suddenly showed that a loan company had done a credit check on you and you had had no contact with that company yourself, you might wonder why they'd done a credit check on you...