Hi Andy
Welcome to Poms in Oz.
I have left your original post as it was but have copied it into the Migration Issues section as well so as to give your query maximum visibility.
I think your best bet will probably be to start by contacting some Migration Agents, because lackof PQE might be a problem here, though I really don't know: please be aware that the word is only "might", NOT "is"!
I would suggest that tomorrow morning, you ring up Go Matilda in Southampton and also Ian Harrop & Associates near Oxford. Plus Visa Bureau, though I am not sure where they are.
All good Migration Agents are happy to speak on the phone for 15 minutes or so at no cost to you. They need to be able to work out how good their chances would be of being able to get you a visa.
When you have spoken with some Agents and have some initial ideas from them, please come back and tell us what they have said. If they say that employer sponsorship is definitely something to look at, we can help you to investigate the idea in more depth.
Meanwhile, have you had a good scout round the DIAC website as yet? If not, it is never too soon to begin that! Please see here:
Department of Immigration and Citizenship
A-Z Occupations List - Australian Skills Recognition Information
Information Booklets - Applications & Forms - Visas & Immigration
Have a look at the engineering stuff in the ASRI list and see who you have to contact to find out more about engineering qualifictions etc, I suggest.
Best wishes
Gill