Hi Sue mac,
as the others have said, the ATOL letter is irrelevant I had a similar experience with a card company when XL went bust - they insisted that I get a letter from the liquidator. I simply wrote to the card company quoting the key phrase from the consumer credit act and the refund appeared about 2 weeks later.
This is the text of my letter:
I am in receipt of your letter dated 30 September 2008, recommending I contact the liquidators in respect of failure of XL.com.
I have obtained the following statement from <name of liquidator> in respect of this transaction:
Unfortunately, neither the Companies nor the Joint Administrators are in a position to make any refund to customers in respect of cancelled holidays, flights or accommodation.
However, as I am sure you are aware, Section 75 of the consumer credit act does not require me to take any action, as the merchant and card provider are jointly liable for the loss.
You are of course welcome to contact the liquidators yourselves to find out if they are in a position to refund you.
Please credit my account with immediate effect and confirm in writing that I have no further liability for this transaction.
I had no letter from the liquidator - just the phrase I included from the web site. I think if you write a letter and appear to have made the effort to contact whoever they want you to, then refer to CCA Sec 75 they will pay out.
Hope this helps.
Ian