Aww; I hate that feeling after the exam that you've done it all wrong. I left a really obvious question out in Biology and felt terrible, and I always think of what I've done wrong in Maths and then think I've failed it. I'm sure you've done better than you think.
Eek, that's a bit of a pain then. I think it's very unfair; surely they know how far away you live; they must have looked at where it was they were sending the letter to ask you to contact them, surely.
I'd go for the interview if you can; you never know if the uni will appeal to you more than the others you've applied for.
