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Skyfall took over US$300 million at the US box office, so James Bond is definitely popular over there. You don't get to those sorts of numbers otherwise. http://www.boxofficemojo.com/movies/?id=bond23.htm
I think the same could be said about Sherlock Holmes. He's big in both the UK and the US (for example, there's a TV show called "Elementary" that's running in the US and quite popular, based on Sherlock Holmes http://en.wikipedia.org/wiki/Sherlock_Holmes ) but ludicrously popular in the UK.
So it's a question of degree. They're not obscure in one place and known in the other. They're well known in both, but tear the doors off famous in the UK.