Ok, sound advise that,

I suppose the attitude to have would be fuck it, however I think if someone took £400 of your money you would have a different attitude to it.

I'm more interested in where I stand (or my mate whos exhaust it is) with getting it back legally, there was obviously no receipt, however person in question was paid by bank transfer although note added only said car parts.

I'm not a solicitor nor do I know one or know much about the law, that is maybe the advise i'm looking for