Contact experian or equifax to get a copy of your credit file to see if there's any mention of it there : this should cost only �2 or so. Also, it may be worthwhile going to a different lender. Even if nothing shows up in a credit search then the original lender may keep a record of it anyway (although there may be a time limit on how long they're permitted to do this - possibly 6yrs but I'm really not sure).
Or you could just phone a lender and ask them the same general question without committing to a credit search.