The Data Protection Act prevents credit reference agencies from revealing such information to anyone other than the debtor (who has to prove their identity before such information can be divulged) or to potential lenders who have received a credit application from the debtor which acknowledges that a credit referencing search will be taken up.
The only publicly available information relates to lists of people who've been made bankrupt (or entered into an IVA or had a Debt Relief Order made against them)
http://www.insolvency.../bankruptcysearch.htm
or who have had County (or High) Court Judgements (or fines) made against them
http://www.trustonline.org.uk/
Chris