WelI should point out that not all the British press is anti-Israeli. If you read the Telegraph you'll see mostly (though not entirely) sympathetic coverage. The Telegraph is the most right wing of the quality papers though, so you'd expect that. The Times is pretty balanced and neutral towards both sides, but you won't have read any of their stuff because of the paywall. It's the 'liberal media' over here which is very hostile to Israel. This includes the BBC of course, which likes to think it's scrupulously neutral but quite clearly isn't, and which is the dominant player in UK news output.
I have a personal theory which may or may not have any validity. Anti-Israeli sentiment has always been there on the British left, but it seems to have really kicked off in earnest since the Iraq war in 2003. My theory is that the huge anti-war movement that happened at the time has taken over the British left, which has had a number of knock-on effects. One of these is a kneejerk cynicism about the motives of the west in any dealings we have with the arab world. Israel is seen as an American puppet, and is involved in an asymmetric conflict with what are widely perceived to be defenceless arabs. As such I don't find it terribly surprising that a whole generation of left-leaning Brits who first got passionate about politics when they joined the anti-war movement have naturally taken up the Palestinian cause in a big way. I may be reading too much into this, but I think there's definitely something there. Anti-Zionism strikes me as very much an extension of anti-Americanism.
I have a personal theory which may or may not have any validity. Anti-Israeli sentiment has always been there on the British left, but it seems to have really kicked off in earnest since the Iraq war in 2003. My theory is that the huge anti-war movement that happened at the time has taken over the British left, which has had a number of knock-on effects. One of these is a kneejerk cynicism about the motives of the west in any dealings we have with the arab world. Israel is seen as an American puppet, and is involved in an asymmetric conflict with what are widely perceived to be defenceless arabs. As such I don't find it terribly surprising that a whole generation of left-leaning Brits who first got passionate about politics when they joined the anti-war movement have naturally taken up the Palestinian cause in a big way. I may be reading too much into this, but I think there's definitely something there. Anti-Zionism strikes me as very much an extension of anti-Americanism.