Nevertheless, Erwitt-like I managed to sneak this one when I was there a couple of years ago: http://www.web-options.com/Water.jpg
The Tate Modern too - I did manage to get one shot a couple of weeks ago before they complained:
http://www.elvum.net/gallery/tate_modern/tate5
They let you take photos in the Turbine Hall, at least, and that *is* the most impressive part of the building... :-)
In the case of the free museums and galleries, they wouldn't *really* mind losing the small fraction of visitors who find their photography policy annoying, and they probably make useful money from the extra postcard sales, so it's not really surprising.
S
