Thanks @BankFodder for looking into this with me, much appreciated. I believe I have a strong case indeed but enforcing it might be tricky as you pointed out.
I wasn't aware I could sue the individual and also the ltd company as co-defendants, I thought it was one or the other. That would probably be wise in that case. Indeed my receipt for this purchase is handwritten on a piece of A4 paper, with the individual's name, his company name (minus "LTD") and his business address.
The company is located 30 miles away from me, not too far. I have been to his unit twice, once