What level are you at currently? I thought about it, but when I looked into it you can get onto a PhD with a 1st and a relevant final year dissertation, which saves the 9k price tag on a masters.
I'm about to start the Natural Science degree and intend on doing a masters in Astrophysics at Liverpool Distance Learning. But I was going to go your route and due to the fact you will be studying a lot of math I don't see a problem in transferring to a masters as it's all theoretical so you won't really need lab experience which eludes physics students
Cheers for your replies. Every Uni I contacted said it was valued no different and they were only interested in me achieving a 2:1 My plan is to work abroad after a Msc which is why i wanted one from the best possible Uni. Are you guys working as well?