That thing? According to Parkers, about £1500 for a private sale. I might be able to get more considering its got full electrics and perfect bodywork
BTW it cost me > £1400 to insure it when I got my licence. And that was at 22. Id dread to think how much it would cost at 17. To make it even halfway affordable hed have to get one with a tiny engine and that would be a bad idea in a Golf. Tell him to get a Polo instead