best bet would be to ring around buddy.
Boostworks 82990621
Southern Hi Tech 8277 4400
Graham West 8277 5688
Mildren Race Engineering 8443 8299
etc etc.
you cannot alter a numberplate in any way, be it cutting or bending, however ALOT of import owners do, simply so it can fit in the standard mounting position. I doubt regency will pick on that too much tho.
but ring them and they will adjust your agreed value according to your modifications. hopefully. or weasel your way into shannons and they may do an inspection before they work out your agreed value.
reminds me of a cricket scene from comedy inc where the rangas are in the changeroom ready to bat, but no one wants to go outside in the sun, everytime ones goes out they leave a ball on middle then run back
makes the thousands of drivers, import and otherwise, with aftermarket suspension think doesn't it? Not that it says anywhere that coilover suspension is a defectable item, as pete says below, adjustable is defectable, which covers 99% of aftermarket coils.
edited, my bad
so theoretically speaking, id i slam on the brakes and go up someones backside, and write my car off, they can deem my cover invalid because coilovers and aftermarket wheels may have contributed to increasing my braking distance?