Kensington and Chelsea is at 42.11%
Presumably that's mostly Russian.
I think there's a lot of different languages there, certainly there's a lot of French people in South Ken at least - the Lycee is there.
Quite a few Russians also (edit - I missed TTT's post above). And all the foreign students in the Imperial College halls of residence off Exhibition Rd (and a couple of other places).
@christianSpaceman started
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Presumably that's mostly Russian.