I used a permanent marker to colour the bands. Its a good way to experiment. It cleans off easily and it "weathers" more quickly. Once I decide on something I like I'll use paint and do it properly. I'm thinking I'll try darkening the groove to high light the rings next, the reverse of what you see here.
The picture of the emitter shows the weathering.
I'm not in the UK, I live in Ottawa, Canada.
As for points, I'm walking the Jedi's path. Who wants to fly a Tie Fighter?