I recognise the awful experience you had in the 1990s, RedHotWings, as a student at the Jewish Free School - I observed the same antisemitism toward JFS children in the 80s.
I often took the bus that went by the JFS in Camden. By that time it was already heavily protected with high mesh fences all around.
As soon as the JFS kids set foot on the bus, the other schoolkids launched into a barrage of verbal abuse, mostly including the Y word, with some pushing and shoving and the odd foot stuck out to trip them etc. as well.
It wasn't just 'interschool rivalry' as the children from the other schools didn't interact much. It was beyond doubt antisemitic abuse, which the non-Jewish children seemed to be very well-versed in, even at that young age.
If the abuse got too loud, the driver would shout 'Settle down back there!', but apart from that the Jewish children were unprotected from this gauntlet of abuse which they had to endure every single school day.