For some reason my Mac's keyboard has changed fro British English to US English. This means that when I need to do a "£" sign I need to hit option+3 rather than shift+3, which is pretty irritating.
I know that if I go into System Preferences > Keyboard > Input Sources I can add a British English keyboard and then switch to it. But how do I then set that British English keyboard as default and delete the US English keyboard? When I select the US English keyboard in the list of keyboards, the "-" symbol at the bottom of the list is greyed out: see screenshot below.