Assuming the radius of the lip was A-OK, are there any SVA rules as to how far a front splitter / rear diffuser can protrude from the main bodywork?

Cheers!

Nothing specific other than the usual radius rules I think. You might have to remove the diffuser/undertrays though if the tester cant see stuff above it that he needs to inspect. My tester said, although he couldn't see everything above the diffuser clearly, he was happy with the standard elsewhere not to have it removed. It wasn't flat floored all the way though.

adrian

Both front & rear wings were on my car at SVA - they may have grown a bit since & they hadn't got the pointy bits on at the sides (front) - but you shouldn't have any probs regarding SVA as long as radii are complied with.
It will also have an effect on where they take the "baseline" above which they check radii - assuming it will lower your baseline then it could mean more radii being checked.

Thanks guys!