Hi BrenOzUK Webster,
On the basis of the information provided, you have correctly been declaring your Australian superannuation pension and Australian bank interest in your Self Assessment Tax returns. You can claim Foreign Tax Credit relief on any Australian withholding tax deducted from your Australian pension.
There are no Income Tax implications re: the transfer of monies from an Australian bank account to a UK bank account (unless interest arises) so you would not have to report any such transaction to HMRC.
Tax on foreign income
Relief for Foreign Tax Paid 2021 (HS263)