If you have owned and have had the cars registered in your name you can bring them over as a personal import.
http://www.infrastructure.gov.au/roa...f/VSB10_09.pdf
I would strongly suggest dropping Jason (Purge98) a PM he has been through the process and can tell you how it went in more detail.
Many of the theAustralian regulations accept or even dictate european compliance for example we must have "E" marked lights etc.
Oh and Mike if you leave that car to rust away in the UK you must be mad, that is one beautiful car and would have no problems with rego over here. Well done a fantastic build.