Hm... then they are switched, # to get £ and vice versa.
Odd, I've got UK layout (the annoyingly shaped enter key..) and when I check in Fusion, shift-3 gives # for me. Perhaps my layout is US then ..
So http://en.wikipedia.org/wiki/Keyboard_layout#UK_and_Ireland this suggests it would be the key on left from the enter/return key (lower row of the two), as lower case. (I guess I should remember better using that layout 8-5 nowadays..)
I've figured out a solution. I just switched the keyboard layout from GB to US. It all keys seem to work and the pound key is now replaced with a hash key.