Thanks for the warm welcome guys. I have a big yellow gaudy plate on order, I like them-yes it's a matter of taste :-) I'll keep the other one so I can revert if I want to. I can't see it being illegal with the boot seemingly designed for it. Sounds awesome but the engine light came on-code reader says purge valve system. I took the valve apart, cleaned the bits and reassembled-no joy. Could be another part of the emissions system. Anyway, since it doesn't seem likely to harm the engine I've cancelled the light for now and will investigate again if it reappears!