I tend to think the 45 percent figure cited is far too low. I cannot imagine that four out of five British people genuinely believe that any Jew, particularly one with an Israeli passport, is as loyal to Great Britain as an actual Brit is, unless by "other British people" they were thinking of the mainstream political elite. I daresay most Jews in Britain not named "Milliband" are considerably more loyal to Great Britain than David Cameron or Nick Clegg. But it's a stupid characterization anyway, as it's not "anti-semitic" to believe a Jew is primarily loyal to Israel. I should think it's downright anti-semitic to insist otherwise. Every American living in London I know would be downright offended at the idea that he might be more loyal to the Queen of England than to the Stars and Stripes.
Hell, it's hard for most of them to go more than a week without reminding an unsuspecting Englishman that "we kicked your ass in 1776 and if it weren't for us, you'd be speaking German." On the other hand, some of my English friends do still insist on referring to the US as "the Colonies".
What I think most people fail to understand is that nationalism is not rooted in hate, but in love. It is love for one's own people, one's own kind. The artificial substitution of "country", as in the sense of "geographical place with a government" for "nation" in the sense of "genetically kindred people", has confused the issue for a long time.
Nationalism is why "Sweet Home Alabama" strikes a deep chord in everyone who hears it, even if they have never been in the United States and couldn't find Alabama on a map. It's a love song by a southern man to his own people, and even if we don't share that particular love, we understand it, we recognize it. And anyhow, Southern Man need not hate Neil Young to know he doesn't need Neil Young around.
Citizenship is ersatz nationalism. It is false, it is fake. Unless you understand the difference between citizenship and nationalism, you will not be able to make much sense of the events of the coming decades.