seem it wasn't handled the best way by Twitter, but really, the whole brand/identity holders thing is a long standing valid thing on the internet..(re: domains etc)...so I dunno, shouldn't be that much of a surprise?
the company is Tower Bridge Exhibitions and doesn't have a trademark on "Tower Bridge", kicking people off to give a company a shorter handle is wrong.
Word of the day has to be: Spime http://en.wikipedia.org/wiki/Spime