Will has asked the key question - have you paid him?
You are in so much of a stronger situation if you haven't, otherwise it is a question of getting any money paid back.
Further than that, then it is a question of whether to use the Small Claims Court to try and obtain a judgement for money - even then there is no assurance that he would pay.
As to the business of whether he should be in business at all, Trading Standards are the only folks I know of who could act, other than a call to 'Watchdog'. This might help make you feel better though it won't help to reimburse your losses.