I ask because I just received an offer from Cambridge and from a few great places in the US. I want to go on to do a PhD, probably in the United States. Finance isn't an issue. In your experience, does being from a place in the UK (albeit as great as Cambridge) put one at an automatic disadvantage to grad school committees? Would people with some experience know if a motivated undergraduate at Cambridge can produce some substantial research, since undergrad research is not that prevalent in the UK?