congokid wrote to uk.transport.london on Sat, 9 Apr 2005:

Another guess is that it might have hit an overhanging tree branch that
was lower than usual. I've seen roadside notices along some bus routes
warning drivers of low branches.

My daughter, as a schoolgirl, used to comment on the "Bus-shaped trees"
in King's Avenue!
--
"Mrs Redboots"
http://www.amsmyth.demon.co.uk/
Website updated 3 April 2005