As Said, get someone that knows the workings of a car otherwise you/ he will come unstuck, if high mileage, CAM BELT needs replacing, if that goes Add approx £300 after sales cost for repairs, check the condition inside the car, Eg/ seats condition, does all work this is where the Mechanic comes in, there are thousands of cars out there so tread the water with your bargaining price, your son has the money so he has the winning hand? in other words the seller does want to sell the car & your son has the money, but your son can walk away & look elsewhere. remember to get some sort of Warranty, do not pay for an Extra Warranty as they are not worth the paper its written on. Beware, Good Luck