I think Hotovely is being ridiculous - as a Jew I really hate it when Jews from other countries (usually Israel or the US) take the line that Jews in the UK would be safer in Israel. Until there can be a just solution for the Palestinian people, frankly I will always feel safer in the UK.
There is an issue of defining the problem. The fact is, most British people aren't antisemitic. Most British Muslims aren't antisemitic. But I think the main source of the most virulent anti Jewish feeling, and certainly the only area of any potential existential threat, is coming from some Muslims, and it's not really the same thing as antisemitism, I have heard some decribe it as 'Jew hatred' rather than AS. I'm not worried that white British antisemites, whatever political wing they come from, are going to try to attack synagogues and Jewish schools, or beat us up - that kind of threat comes only from a tiny minority of Muslim extremists who are not representative of the whole.
I suspect there are quite a lot of British Muslims who feel at least ambivalent about Jews, largely because of Israel, and because they don't know any Jews (like most British people). And a minority are very anti-Jewish, largely because of Israel, and although they may tie that into conspiracist stuff, they're not coming from the traditional 'blood libel' sort of Christian antisemitism, and not from what I think of as a traditional British upper-class 'Oh, those ghastly Jews!' sort of antisemitic snobbery.
I think more interfaith Jewish/Muslim work is very important - as I said, adding a human face and disabusing some Muslims who may have been drawn into an idea that we are all super rich and powerful, or that we might harbour hatred against them would help to calm things down. There is no inherent hatred of Jews towards Muslims or vice versa, in fact I think Islam is quite specfically respectful towards Judaism.