I did this in 2004. I bought my cossie over in a sole use container. Company was called Anglo Pacific who are based in Acton, London. One of their employees is on another forum who looked after me.
1. You need to apply for an import approval from DOTARS first which involves filling out a form from the website and faxing it over along with proof of the age and ownership of the vehicle. I can't remember where my certificate came to, either UK or Oz. The shipping company won't ship it without it as it cannot be allowed in at this end
2. Then organise shipping (I recommend a container as you can put posessions in it with this company, actually in the car)
3. Then send off the "vehicle has been exported" part of your log book. Older style ones have a tear off part which needs to be recorded and sent back. Newer ones with the different colours, it is the purple section and it doesnt come back! My car waited for a month until I chased that up.
4. Shipping takes about 6 weeks
5. I know one of the larger clearance companies at this end through my g/f, they pushed mine through quite quickly. I had them ring 6. me before opening the container so I could inspect the car at quarantine
7. Spent another few days there while they went through all my boxes
8. Collected the car on a flatbed truck and took my stuff to my new house
9. Compliance is a seperate issue and not easy on a modified vehicle
Container was about 1200quid plus 150ish quid insurance
Tax is payable on the declared value
Not sure on clearance costs as I had a different rate
HTH
BTW - Its Geordies