I have come into possession of a sealed MBP 13" which was bought a few days before the upgrade at PC World (UK). I have the receipt for £918 and was wondering where do I stand if I wanted the new model? The current MBP is £999; do you think they'd simply ask for an extra £81? Ideally, I'd want a refund and I'd buy it from Apple with my educational discount, but that's not going to happen. The MBP was bought with a gift card if that makes any difference, but I wouldn't think it does. Thanks!