Number plate surrounds are not illigel I don't think as loads of garages fit them, and with number plates it just depends on what copper pulls you, when I had my first car I was running black and silver plates on my black 04 corsa sxi got pulled near my house and the two coppers just warned me that if I was stopped again I could get a fine. So i left them on and got pulled in Hastings, one of the coppers told me to put on my legal plates on which I had in the boot the other was telling me to leave them on and get a certificate from an mot center which would have cost me £40 so I just changed them over and that was that. Then I was running German style plates on my Audi had them on a few days and went past loads of coppers no problems as soon as I go to west Sussex who have strickter police I changed back to my legal plates but was still reported to the dvla and slapped with a £60 fine so I don't bother with different plates anymore.