"your point is mute"
it's MOOT point
and while I'm at it, "pure as the driven snow". Ok. It used to denote impurity. It was a derisive thing to say when someone said something or someone was pure. Driven snow is not pure. Have a look at the snow on the road where buggies have driven through it. It's slushy and dirty.
What is it with some Queenslanders who can't say "variable"? It's pronounced verable. My ex, a Queenslander, used to say sach-et (for sachet), and re-sept (for receipt). Arrgh!
(I shouldn't talk, I have a very, very broad Aussie accent... very broad. I'll never be an announcer for BA!)