Depending on how you're feeling, you could sell your debt to a debt collection agency. You'd get some money back at least, while he'd have to deal with merciless bailiffs.
Court will no doubt find in your favour; problem is that it doesn't sound like he has much cash and has a lot of other people that he owes money to.
I'd be prepared to write off the money, or at least a significant proportion of it. By the sound of this 'mate', it's a bit like being owed money...