The best thing to do would be to get in contact with a lawyer and get their advice. This is a legal matter, so you should seek professional advice.
Also, that bank is in my town, its only a 5 minute drive away. Do you have an address for this guy? (didn't see whether or not you had posted it). Maybe I could go check it out for you...
EDIT: Just saw you already posted it! That address is in London, so I cannot help. However, that bank is located, like I said, 5 minutes away from me. If theres anything I can do, I'll be more than happy to help. Just let me know.