We've got a 12 year old exchange student staying with us at the moment, and we think we ought to make an effort to go out with him on Sunday for the day, along with our other kids (16,13,5). Apparently it is going to piss down, which probably rules out theme parks. Any other suggestions within 2 hours of Cambridge? If we can pay with Tesco vouchers, even better. He is a youngish 12, btw.