You have two options –
Persue them for the £240+VAT which can be done through the small claims court, you will probably need to issue an invoice for the sum.
Or you can issue a claim for damages & losses through the Intellectual Property Enterprise Court (small claims track), where you may receive more than the £240… it’s easily doable by yourself if you want to swat up on the legislation, and be sure to include a flagrency uplift if they’ve removed/ignored a prominent copyright notice.
Here’s what happened with out case at the IPEC. topic66155.html
What I would be doing, is looking at how you got in the position in the first place, did you not take a deposit?