If anyone does need a piece of black vinyl with the logo reversed out of it, I think I still have a spare one lying around from when I got mine made up. The logo needs to be distorted vertically because it sits at an angle. Someone had tried to scrape the bluey-green tint off the one I had, and made a right bollock of it. I ended up scraping the lot off, fine-sanding it, and sticking the vinyl on.
Also, I have a CorelDraw file with the logo, or JPG. Surprisingly hard to find a decent one on the tinternet.
Can't recall the law regarding lights, and whether you're only not allowed blue ones facing forward (doesn't seem to apply to lorry drivers with their bloody great Rangers logos in the back of their cab

) - but a grumpy copper might take exception to the bluey-green logo in the back windscreen.