Mathematics and Computer Science... I'm still not sure about the computer science part, but I enjoy a challege, and if I don't enjoy it then I'll have the opportunity to drop it at the end of my first year
I didn't think I had the slightest chance of getting an offer, and 2 (out of 5) or my interviews went really badly!! In 1 or them, I had this weird German woman, and a random German undergraduate sat in the room with us as well. The German guy seriously looked like goofy, and all he did was laugh through the whole interview... and every time I asked a question, the German woman would burst out laughing too
So I just sat there wondering what I was meant to do... it was really strange! The interview at Exeter was my favourite interview, and the tutours were really nice, so I'm looking forward to going there! And, like you said, it's right in the centre, which is really cool coz you walk out the entrance and... oooo... shops!!
Don't worry about the two-subject thing! If you really wanted to do another subject, you could think about staying on for a few more years after your French course...