Iain, thanks, i'll be looking at that very shortly.
Kris, i know it sounds a bit radical, (bl00min dangerous, he says!)
but its all been tried and tested before.
Have a gander at tyre stretch images, such as this one
TyreStretch.com - Image Library
i meant to type 195, not 185 actually, stupid sausage fingers!
you'll see that it's not that unfamilar looking, and it means that you can normally run a good width wheel, on a pretty low car, and get away with either not rolling or modifying the arches, and get no rubbing issues.
Lou, no wonder you're called loopy!
ha ha! go on, good to see you out there, give it stacks!
let me know if you have any hot bits going, always after a hot bit me!