Jim,
the rise in antisemitism has in Britain has been put down largely to the swing to the right in Britain brought about by Brexit

No Jim. The reported doubling in incidents long predates Brexit.

Telegraph on the report,
"Attacks spiked during the summer months(2014), around the time of the Israeli action in Gaza, but the report notes that incidents were already above average levels in the early half of the year."

"The figures are likely to provide only a snapshot. But separate figures from Scotland Yard show a similar pattern, with reports of anti-Semitic hate crime more than doubling but Islamophobic attacks also rising significantly"