Tom's mum - good luck to your son.
I think if he has chosen this uni he will probably be inspired to work harder there, than if you had tried to convince him to go to another uni. One of my friends at school who would have got into Oxford eventually chose to go to Sheffield because that particular course was rated higher there than at Oxford. Another friend of mine did Physics at Brunel and ended up doing a PHD at Stanford, USA! They had only asked for CCE to get into the course initially,but she still managed to end up at an Ivy League in the end.