Personally, I think plod (and car drivers) are more eager to see that you have lights on your bike rather than whether or not they conform to any kind of British standard.
The other night I was driving along an unlit country lane when all of a sudden a cyclist, dressed entirely in black and riding a black bike, with no lights, reflectors, nothing, just appeared out of the gloom ...
As I went past, I wound the window down and said,
"Excuse me mate, do you know that you're almost invisible dressed like that? You should at least get some lights!".
"Ah, right" was the unenthusiastic reply ...
Personally, when I'm in the car at night, I prefer to see cyclists with as much lighting and hi-viz stuff on as possible - the brighter the better!
I wear a hi-viz tabbard and have front and rear LEDs when I ride at night. I have no idea what standard they are, all I know is that they make me visible at night. Also, I always set the rear one to flashing mode because it draws the eye more than a constant light.