Spacers on both top mounting brackets.
The bottom one ( the plate to g/box) would have to have holes opened.
you might be lucky and get 10mm extra clearance.
Get 14" wheels insted or get sump and oil intake moded to more slim line look ( smaller cc ).
Look through "Scotty's Roma" thread.
Or the best and cheapes solution would be to bolt down 4x4 sump guard, no need to worry about grounding out - just few sparks. I can get you 4x4 sump guard for £20+ delivery.
As you're in Derbyshire I'm sure Dragon Man could fit it for you.