Clumsy typing in the dark has turned what use to be the sterling sign into this #. Test !@#$%^&*()_+ Apparently the thingy over the 2 has gone wonky as well. What magical button pushing fixes this?
You've set your keyboard to American. Have you got a little square in your taskbar with EN on it? Click that to select English UK. If not, Control panel, Regional and Language Options will have stuff for this.
Not sure what the keyboard shortcut is, sorry.