Stuart Chapman wrote:
When the F-111 was purchased its intention was to bomb Jakarta....

The actual requirement for replacing the Canberra was for the strategic
defence of Australia anywhere in the region and an offensive tactical
strike capability if Malaya went pear shaped.

Also Australia still had ideas about joining the nuclear club when they
were ordered in 1963. The alternatives under consideration included the
TSR-2 and Mirage IV.

Cheers
David