Christopher Meyer's DC Confidential
The excerpts of his book are here. It appears that former PM John Major was staying with the ambassador on 9/11. I was intrigued by this:
John Major was due to head off to a meeting of the Carlyle Group, one of the most powerful private equity firms in the US, whose European arm he chaired.Catherine urged him not to go downtown, but he did.
He returned at lunch to say there had been a brief meeting of the Carlyle Group people, who had then gone their separate ways. "I met Mr Bin Laden this morning," he reported. This was, it transpired, one of Osama's many siblings, a major Carlyle investor.