I don't know how the Jewish vote breaks down in the UK. A number of wealthy Jews such as the Marks family are mostly Tory wets. British Jews have generally not been Zionists, in fact are actually anti-Zionist, but quite a few are observant.
Jew hating as opposed to the usual social prejudices has normally been a splinter right wing working class thing with a number of High Tories such as the very wealthy Duke of Westminster providing money to the ‘Jew-Communist-international Jewish plot’ activities.
Labor is a mass based party and this sort of visceral hatred is really menacing as well as crazy.
Until its too late
Fear that right wing or Christian conservative means Pales, Pogroms and Persecutions
Trumps all
Or Messianic Progressivism is their religion and Judaism is just a birthright club
How it looks from here