The Prime Minister's Jet at YSSY?
 

I have regularly seen a white jet at YSSY with 'Royal Australian Air Force' written on its side livery. it is usually parked at the private jet base near KFC and McDonalds. Is it the Prime Minister's personal jet? Does anyone have photos of it?

Guessing one of the two RAAF jets A36-001 and A36-002.
Both are 737-700 BBJs, used by the RAAF for VIP ops.
https://www.airforce.gov.au/technolo...g-business-jet

Adding to Tristan's reply that it isn't always the case that the aircraft would be there for the PM - they are used by the GG and ministers as well as anyone else who is granted permission to use them (and that includes the Opposition Leader during the election campaign). The other thing to add is that the VIP fleet includes 3x Falcon 7X as well as the 2x BBJ - same livery but obviously the aircraft itself looks quite different!

As does the MRTT in VIP config - A39-007 including two ex LH First class chairs and a revised layout that bumped up the cost by a bit.

Good summary here https://www.aph.gov.au/About_Parliam...urposeAircraft

I highly doubt it,
but are there any images floating around of the vip cabins for the 7x, BBJ, KC30 and former 604?

They are not as fancy as you might think.

The BBJ interior is nothing special.