A lot of them are the exact same in every country of the world, including my own. Hell, look at our own media. Newsweak, the Slimes, CNN, Dan Blather. They are the worst self-haters I've seen. If you take 10 dirtball anarchist and hard-left academia types from any Western Country in the world, you'll find that they are easy to pick out anywhere. The only difference is the accent.
I mostly agree with you, except that by New Zealand standards Newsweek is considered conservative! That says a lot about how conservative we Kiwis are. The Poms still have their Telegraph and Guardian, and they still have a sizeable number of old guards at Oxbridge and LSE when their counterparts at Ivy League and Berkeley have all but died out. But Britain is indeed catching up with the leftism of the rest of the Western world - once this process is complete it will be at least a generation after the rest of us (if ever) have broken free of the shackles of cultural leftism for them to do likewise.
Another factor you Yanks have not thought about is there are two types of anti-Americanism in all countries outside the US:
1) Those who hate the US as well as their own nation's past: the types as you described.
2) Those who hate the US precisely because they love their own country so much they want their fatherland to be the boss of the world (again): these are the people who would be super-ciritical of Abu Gabrib and Viernam, but extremely lenient in the case of Belgian Congo or Sudan campaign.
The current crop of British anti-Americanism is an interesting mix of 1) and 2), or a mix of left vs right as well as British vs American if you will. It is not clear cut to Americans just as American conservatism looks murky to Anglospheric conservatives because American conservatism is founded with a set of principles different (similar, but not the same) from Anglospheric conservatism.
Correction to post 79: it should be "Telegraph and (to a degree) The Times". The Guardian crept in without careful thinking.