Oh FFS. Judging contemporary Britain for stuff that happened during the Middle Ages? Your European ancestors are probably just as culpable as mine are, if not more so, because after Cromwell let the Jews back in during the 1650s, most European countries treated their Jews much worse.
Maybe we should still judge America for having chattel slavery up until the 1860s? After all, there are some people still alive who are actually old enough to remember people who were around when slavery was legal in the US.
There is probably a lot more to this story than has been reported here. British customs tend to frown upon foreign visitors trying to enter Britain to work when they haven’t got their paperwork right, even if they are Americans who come from a country that probably isn’t threatening to swamp us with their nationals unlike some countries.
Britain is a screwed up country. They throw open their doors to Muzzie terrorists and those advocating slaughter of British innocents (like the recent murder of a British soldier in the cold light of day right out on the street), but deny entry to Jews who have never advocated harm to their precious country. Who needs ‘em? Not me. Let them continue to pander to those who will eventually take over their country and slaughter them in their beds.