I want to encourage my 17yr old son to build some savings. He has approx £2,000 across a bank account and low interest savings account. He is working over the summer and will earn approx £2,000. He wants to possibly save for a car, go to festivals etc. I want to encourage him to put a bit into a better savings account (encourage not tell him). Any ideas as to the best type of thing for medium/long term saving.