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Names which are popular in UK and not US:
Boys:
Alfie
Archie
Freddie
Harvey
Callum
Oscar (not that unusual in US, but waaay more popular in UK)
Toby (see Oscar)
Arthur (see Oscar)
Finlay
Rhys
Stanley
Jenson (probably because of Jenson Button)

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Girls:
Maisie
Millie
Rosie
Evie
Tilly
Freya
Isla
Imogen
Matilda
Martha
Harriet
Florence
Esme
Niamh

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I don't really have an idea of "British" names, because I'm British anyway, but there are some names which I think American would consider British (because they're posh or a bit quirky), such as:
Violet

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Theodore
Archibald
Cecil
Cornelius
Quentin
Crispin

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However, none of these are actually popular any more!