legal restrictions on aftermarket bodywork mods?

[GreenV8S]

Anyone know what regulations apply to aftermarket splitters/wings/air dams etc? I assume there are some restrictions (so those spikes and whirling saw blades are right out then ) but any idea what the legal situation is?

[deltaf]

You thinking of driving a bit too close some speed measuring devices then GV8?
Bodacia will be most impressed!

[Graham]

i think you meed to find a copy of the construction and use regulations... sorry dont jnow were from though