Everything is Australian. I paid the expensive Australian price for the game and console legitimately
The pricing on the 'Dashboard' store is in Australian. It's the Ghost store that has the Pound pricing. I can use the Dashboard store but that doesn't solve the problem that it's glitched in the game menu.
the issue was NOT due to "maybe" having your regional setting wrong
A fix was issued by IW last night to fix this
Title Update: Xbox One
- Fixes the in-game currency when trying to buy stuff in Canada, New Zealand, Australia and Ireland.
Taken from here Ghosts Xbox One Updates (8/5/14)