I can't help with the storage question, but in terms of keeping your vehicle in the UK for so long I'm pretty sure it's not legal. AFAIK a non EU vehicle can only be here for 6 months, then you have to either import or leave the EU. All the technical stuff from Revenue and Customs is here. Whether anyone checks or not is another question. I also drove an Aus registered Landcruiser to the UK but via Africa. I arrived by ferry into Newcastle and customs just waved me through.
Regarding rego, it depends how legal you want to be and how handy with photoshop you are. No-one will know what Aus rego paperwork is supposed to look like and 3rd party insurance is available from Mototouring with a scan of your rego. I guess how easy it is to renew your rego depends on which state it's with. A couple of past threads on this here and here.
Hope this helps.
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