Step 1:
Obtain your discharge certificate
Step 2:
Wait a short while (perhaps a few weeks) to give the credit reference agencies time to update their systems
Step 3:
Apply for a copy of your credit report. (You're legally entitled to it). Theoretically you need to pay a small fee (usually £2) but all of the agencies seem to offer a free trial anyway. (Just make sure that you remember to cancel the agreement before the trial period is up).
Step 4:
Read the report thoroughly. It should come with information about how to correct any
errors.
Step 5:
Make any necessary corrections.
Step 6:
Check again later, to ensure that the report really is fully up to date.
The main credit reference agencies are Experian, CallCredit and Equifax. (Their websites can tell you about getting hold of your credit report). Those three agencies are looking at credit ratings. However there's also (the rather secretive) National Hunter, which can prevent people from getting credit if their application is viewed as potentially fraudulent (even when it's not):
http://www.guardian.c...-hunter-credit-agency
Chris