I know it's not Barclaycard, but this story will have them quaking in their boots. It should give hope to every maligned and stressed out person on this forum. Cancelling your debts just got 100% easier.

Link to the story below;

BBC NEWS | Business | Court lets woman off £8,000 loan

Quote from the webpage (my underline);
"The main ground on which Judge Smart said Mrs Thorius's credit card debt was unrecoverable was because MBNAicon could not provide a copy of the original signed loan agreement, which is also a requirement by the Consumer Credit Act.
The Judge ordered the company either to repay Mrs Thorius's PPIicon premiums and interesticon, or the value of the commissions it had received which so far has been undisclosed."

1st paragraph - the original signed loan agreement is a requirement of the CCA.
2nd - the payback terms.