Entering the following keystroke combination will result in the Pound Sterling sign being displayed:
While holding down the ALT key, enter 0163 (ALT+0163).
This is known ASCII Code. (Pronounced Ask-key.)
A complete list of all 256 character codes is available at http://www.ascii-code.com/
All manner of Latin-based characters are available. Check it out.
To use any ASCII Code, choose the "HTML Number" and substitute "ALT+0" for "&#".
In this case, the HTML Number is £, therefore when entering text, type ALT+0163 (NOTE: "ALT+" means "While holding down the ALT key, press and release each of the four digits in sequence, then release the ALT key.)
Hope this helps.