Hi Mancman
I have two cb750s from the states, one a k4 and the other a k5, niether available in the u/k. My k4 is as good as the same as a u/k k2, it was blue when I got it but the colour did not do the bike justice. I believe the best colour for this bike is candy gold, a glorious colour, u/k k2s were candy gold or poly blue, both look good--as my k4 is on a "m" plate, the years of a k2 here, it looks good in gold on this plate. My other k5 is the same as a k6 here, have left this in freedom green, it looks better over time. I thought about changing it to the u/k k6 colour of candy red or blue, the bike is on a "n" plate, again that should reflect in a candy gold or poly blue for that year but I will live with it in green. The pureists will pick this up straight away. Its a personal taste the colour-- but I think its important to match colour to the year or you will get fed up with people telling you its wrong-- thats what I get with my "n" reg in freedom green.
regards neal