Do I need to download something extra, or do something, to get them to work? Because at the moment when I press '~' nothing happens. ???

When you press the ~ key, does the HUD go away? Note, you don't use the Shift key with this, just the key that has the ~

If so, then type the command. If not, find out why your keyboard has different key bindings and figure out which one is the ~

The button above "Tab" or to the left of "1" (on a UK Standard keyboard) is what us Brits use to bring up the command console.

It depends on what region keyboard you use. For me the symbol on the key is §. But as the above poster says it is above the tab key.

Crazy brits, cant even use a standard keyboard. Does your keyboard have an ou key too?

Aha! So it was the weird ? key all along! Thanks guys.