Hi --- that call sounds like some sort of scam ...
You can get your credit record from Experian online or by post for £2. Just have a look at their website for details -- you do not need to join any of their services.
My opinions are merely that .. opinions based on experience. Always seek professional advice.
IVA Completed 23rd July 2013 .... C.C. 10th January 2014
Your permission has to be given for someone to credit check you. Which company was this? if they've done it without your permission, then they will be in trouble - you can report them!