I would seriously look in to the value of your car in Australia to see if its worthwhile. We were thinking of taking our Mini Coupe, worth 13k here, but in Aus money they are going for 24k. Its the Aus value that they use for the GST and Duty. So, you have the 2.500gbp for shipping the car over. They add on 10percent on to the selling price there(value), for us its 2,400AUD (duty) taking the value up to 26,400AUD and then another 10percent on top at new value, so another 2,640aud (GST) on top bringing a total of 5,040 AUD which today is 3014GBP. This is the cost you will have to pay to receive your car there.... excluding any possible further quarantine cleaning/clearance which would probably set you back another 400AUD... I don't know how new your car is and what value it may have, but if it attracts the luxury car tax then its another 33percent payment you have to pay as well (if the car is worth over 58k (AUD))...
I think we are leaving our car here and buying something boring there. Maybe a 6litre v8 holden lol