Many banks, and other places in the UK, now mainly have local calling numbers only, such as the 0800 and the 0845 numbers.
These numbers cannot be used from Australia, so we need to find the old fashioned numbers…
Here are a few of the main ones:
Barclays Bank from overseas +44 247 684 2063
HSBC from overseas +44 1442 422 929
Lloyds Bank from overseas +44 1733 347007
NatWest Bank from overseas +44 121 695 9238