I was made bankrupt sept 2009 and discharged July 2010. I am in the process of cleaning up my files so requested credit reports from experian, equifax and callcredit.
Neither have Barclays on the files even though barclays was a creditor.
I was declined by Barclays as well, and although they couldn't tell me why they presumed it was because Barclaycard weren't one of my creditors. I would think they would be able to tell that from their systems whether the account is on your credit files or not.
Personally I wouldn't contact Barclaycard just yet - I would have thought that if you can't see them on your credit files then no one else will either.