Mike,
The restaurant thing works, we have a pub/restaurant here, they were 'caught' a while ago.
Eighteen of them a 'rambling club' arranged a dinner, ate most of it but only 8 or so of them paid, and not all of it, because the food is coooked individually the chef had to run around, so they said it was cold, raw etc. Turns out the pub had been warned about this, they have been around the area doing it, they are all 55/60 ish so you wouldnt expect it from them. Honest.
Going back to the debt collection, ask him for the money and if he doesnt pay get onto ThomasHiggins debt collectors in Liverpool, just google their name and their details come up..
They are brill and know the debt law inside out. As my previous posts they have never let me down yet.
Regarding your card machine, Join the FSB, my credit status isnt brill at the moment but they gave me one from 123send.
Think its £20 per month as opposed to 28 or 30 normally, well worth it better than paying in books, parking probs and all the rest of it.
Good luck Mike, you write a lot of good posts on here and no one likes to see a pro kicked like that.
Murky