Cheers, still not ruled out the Oz option but unfortunately so far I have been proven right and they haven't got back to me, probably because thier sales team are fucking useless and are not interested in answering any kind of technical questions.
So, I emailed compomotive and got a reply 2 hrs later. That's more like it!
On my 2wd Saff I have old school OZ Cronos 7x17 inch et 35 alloys with 215/40/17 tyres . My car is lowered by 35mm and I did have to have the arches rolled but with that done there are no clearance issues at all.