It was the RA-5C the Aussies were interested in, but I suspect the same argument would apply to whatever version.
Here's a para from the article wot I wrote:
'The Australian Government thought otherwise, preferring the TFX and to support this, stated that to use an aircraft as expensive as TSR.2 to deliver high explosive was folly. In fact, CL Hewitt, Treasury Deputy Secretary said that ‘If defence is being planned in terms of non-nuclear war, then TSR.2 is very much too expensive to think of using in conjunction with high explosive.’ As for the RA-5C Vigilante, EJ Bunting, Secretary of the Prime Minister’s Office, described it as coming a ‘long way third to the TFX and TSR.2’ and that the (Australian) Air Department ‘have been led up the financial path by US financial interests.’ Bunting also pointed out that the RA-5C Vigilante would require in-flight refuelling and if tanker aircraft were factored in, that would mean a 25% cost increase, making the TSR.2 look ‘not so much more expensive.’ Hewitt stated that there was little point in opting for an aircraft that neither the RAF or the USAF (alongside whom the RAAF would no doubt be operating in a war) had any interest in. The Vigilante would need to be fitted with low-pressure tyres, antilock brakes and braking parachute to allow it to operate from airfields in Australia and south east Asia.'