Yes, it was a good gesture.

The "Last Night" of The Proms (a classical music festival) was rearranged and included much American music, as well as a minute's silence before Barber's Adagio was played (you'll know it even if you don't know it's name). The finale of Beethoven's Choral Symphony replaced Rule Britannia and Land of Hope and Glory, traditionally played on that night.
http://www.bbc.co.uk/proms/2001/september.shtml

>< lump rising in throat, eyes welling over just thinking about it > I never became more emotional during all this than when I saw on ABC News the film clip of the National Anthem being played during the Changing of the Guard at Buckingham Palace and seeing numerous Americans at the Palace watching this transpire. Words can not express how I felt. From what I here, this has never been done.
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>I spent the rest of the evening flipping channels hoping someone would replay that in its entirety. I never saw it again and oly a short paragraph in our newspaper today. If anyone knows of a URL where I can get this, please let me know.