Who currently has control of the site? If you put me in touch with them, I can tell them how to get me the information I need to pay people back.
If it's Intersango/Bitcoin Consultancy then they need to make that public.
That's very unlikely. The Bitcoin Consultancy made the Intersango (version 1) code open source, and WBX used that source code. Other than that, the Bitcoin Consultancy is in no way related to WBX as far as I know.