Thanks for all the replies, they've all been really useful.
Part qualified is basically the point where you just have sat all the professional level exams and just have 3 'finals' to sit to become chartered. A lot of jobs in the UK will either advertise for a 'part qualified' or 'fully qualified'. However I think seeing as though work are paying for my tuition and exams and I can have them all finished by Novemember (provided I pass) then it does make sense to do these and get them out of the way as from your replies it definitely seems like this would make the application process a lot easier.
Thanks for the heads up on Jonathan being able to come on my skilled visa - this takes a bit of pressure off!!
In terms of a job I would look to move within the firm I work for at the moment initially - mainly for security because as you said there's no guarentee we'd find work if we went out there with nothing lined up. From reading other posts on the forum it seems it would be easier to get a different job once I've got a couple of years work experience in an Australian work environment.
I have looked into the WHV - and even though it seems to be a good short term fix and will get us into Aus for a year I'm not convinced in the long term it would work out the best way if we decided we wanted to stay. I think I would rather have everything lined up and sorted for the long term whilst we are still in the UK and have the security of a job / regular income behind us.