Turn on the U.S. and British keyboard options in System Preferences > Language and Text > Input Sources, and then choose Show Key board viewer under the flag in your menu. You can see that pound is located in a different place between the USA and British keyboards. There is also a difference with extended keyboards, and PC keyboards... perhaps by fooling around with these keyboard settings and using the keyboard viewer he can get a handle on where special keys are on his particular system.
Thanks Robert >> I've passed on your comment. Sounds likely he'll be able to sort the problem out.