So I've ordered and fitted a set of 275/40/R20 106 rated Haida tyres.
Using these wheels I had to source some slighly longer bolts, but also tapered, not radius ones like the standard bolts.
Anyway, a picture speaks a thousand words, so here they are:
One this that is now painfully obvious, is how desperately it needs lowering. How much by I'm not sure, but I'll hold off doing this until the interior is finished, then I can level it off nicely.