And golders green, but there's more variation there, although traditionally they've supported the Conservatives,
In part that'd be because they're richer; IIRC the party affluent Jews in Golders Green and so on voted for when the local Tory establishment was at its most anti-Semitic (this'd be over 40 years ago now) were the Liberals, not Labour (you still get traces of this in local elections, weirdly). Mind you, under normal (ie; non-Livingstone-influenced) circumstances Labour does a lot better in the strongly Jewish (according to the census; so many secular Jews are missed, changing the geographical pattern) parts of Barnet than you'd normally expect for affluent-to-rich middle suburbia. Not so much in Harrow for whatever reason.
In that part of London (extending out into Herts), yeah (since the '70's or so anyway). The Manchester and Leeds Jewish votes have been quite heavily Labour in recent General Elections IIRC.
Though even Livingstone did well with them in 2004 IIRC. But that was before... well... aha...
Fun fact; in one ward in Hendon with a big Jewish population, several hundred more people voted for the Labour candidate in a local council by-election than for Livingstone (both were on the same day). And it's obvious from turnout figures that a lot of them didn't vote in the London elections at all.