would it not be easier to just sell your car there and then buy another one when you got here... we did that - sold our two cars and then when we got here had a hire car for a week or so and then just looked and bought another one.
We did not have furniture etc - again - simply got rid of as much as possible. Sent three large boxes and then whatever we could fit in our suitcases. However - we had a house to come to ( I had rented it out whilst I was away) and some contents that I had in storage whilst I was gone.
We stayed with my mum for a couple of weeks which gave us time to sort out brains out and get organised to move - included buying the furniture etc.
To us - whilst it seemed a bit of a pain - it was much easier in the long run than trying to ship furniture etc back. We simply packed in the boxes - things we could not be without - photo albums, toys for dd1, linen, paperwork, books etc.
You could rent - fully furnished whilst you sorted out what you needed for your house - so many places to buy stuff that are really reasonable here in Aus. We are still slowly getting sorted.... but we are also painting and decorating at the same time.
The shipping company that we used - Excess Baggage - we looked at their pick and delivery issues, insurance, storage rates etc. They sent the cartons to us and then arranged for themto be picked up whilst in the UK and then delivered to our address here in Aus.
Probably not much help but that is what we did.