I think you are on a hiding to nothing. If the firm is now bankrupt, the only ones who will get any money are the good old VAT man, tha tax man, and the liquidators. Small claims court you might, only might, get a judgement, but that is no guarantee that you'll get paid. There is very little you can do. Even debt collectors are no guarantee. You have lost your money I am afraid to say. I have been there a few times in my 25 years of trading, and now take deposits from new clients, or expect payment on invoice. I have even been known to have gone into a restaurant, and removed all the menus I had supplied: even from the customers reading them! Didn't get me my money, but I felt better for it!