Hi Lelldorin, thanks for your help.
Alt appears to be working like Ctrl would on a BSD or Linux, but nothing appears to be working like an Alt.
I'm not fussed about having to use a different key, but I do need an equivalent of Ctrl and Alt to be able to use Emacs effectively.
I've been messing around in Keymap and the Terminal settings, but I'm not really getting anywhere. Got any ideas on what to do?