I feel there must be a simple answer here, but I can't find it...
The keyboard is set to English (UK) via the globe symbol to the left of the spacebar, and language is set to UK and keyboard options seem ok, yet I have no sterling pound sign, just this: $
If you press the 123 SYM key on the keyboard (bottom left) and then you'll see a button with a blue dot on (to the left of the keyboard). Press that and it will give you a whole new set of alternative symbols, and one of those is the � key.