Save for the Thatcher/Major era, the Poms have been wonky for generations. Once Blair goes - and he will go sooner than later - Britain will revert to form. The place is completely stuffed!
If America is relying on Britain for any long-term support, it is in for a major letdown.
Much better for the US to look to Australia. We Aussies, apart from a brief peiod in the '70s under the lunatic Whitlam, have ALWAYS stood shoulder-to-shoulder with our American cousins.
I think traditionally Britain lies between Australia and Canada in terms of what they think whether working with the United States is in their national interests. Unfortunately the whole United Kingdom is becoming Canadianized (while at the same time even Canada itself is also becoming ever more left-leaning) in this policy area.
And as for wonky Poms, we don't need to venture outside this forum to know them. Apart from Ivan and a couple of others, most of them are quite shaky.