Cambridge has one of the best physics/mathematics departments in the world. Studying there would probably be a desire for anyone considering a PhD after a MSc or something equivalent. But once you are admitted, you need to find funding, which is even much harder than being accepted, (read on several sites). Now I was looking into US universities. Harvard has a full funding programme for anyone who studies there and I expect the other league ones to offer same opportunities. Theoretical physics with as much maths as possible - what would you recommend? Is there a big difference between UK leading unis like cambridge and e.g. Harvard? Are there reasons to choose for a US uni instead of cambridge (in the ultimate scenario you get an offer from both)?