Labour, like the US Democrats, see that Muslims have more money to contribute than Jews do. Jews need to understand that, while they may love the Left, the Left does not love them back anymore.
Keep in mind also, that there’s a LOT of mudslime money invested in the City of London, more so, on a population basis, than the U.S. Politicians being the usual scum they are (not always) are quite happy to kow tow to islamofacists in the ME. Ideology is the main driver but money talks.
Certainly there are more Muslim votes.