Help! Cannot Afford Car Finance:-?

[Witters, Man That Can!]

My friend just purchased a car this week and has told me he cannot afford the payment. This is his story:- He has previous bad credit that stopped him from getting a competitive rate. He went to a dealer that charged him 33%. They also put on x3 insurances. The term of loan he has chosen is a crazy 54 months. With the insurance this means he will be paying back around £16,000 for a car worth only £3,500. He has looked in to the insurance part and can cancel this but he cannot return the car. He is now really worried. What would happen if he gave the car back and then decided not to pay for it? How would the CCJ work. How much do you think he would have to pay back on monthly repayements? He is currently paying for the car part alone £170.00 per month. What do you think he should do. Again he has not even paid one payment yet. Thanks for your help