Stymied again wrote:
After upgrading my (UK) iMac to 10.7 I find that the £ and # keys are transposed i.e. shift-3 gives # and alt-3 gives £ which, I assume, is the standard US layout. I also upgraded my MacBook but this transposition didn't occur. What's going on here?!
and turn on the Show keyboard & Character Viewer
select input source
<SHOW INPUT VIEW IN MENU BAR> then menubar show keyboard view.
With your option key you can get an overview.
My alt-3 is showing this £
shift-3 is showing this #