The reason for my initial post was to raise awareness. BS 6102/3 IS a requirement. It throws up any number of anomalies. I have two front lights,an El 300 which is 6102 and a more recent one which is more powerful, brighter and isn't. Were I to be involved in an accident, I could be considered partly liable if I was using the brighter light, as I would be "breaking the law".Similarly, I was very angry to find that having happily sold me clipless pedals, the shop didn't inform me that I was "breaking the law" when I used them at night. Illuminated bands on trousers (which I use) are not (in law) an acceptable substitute, even though again they are far more visible. The police have generally taken the attitude that any light is better than no light, which is why no action was taken ,for example,against cyclists who displayed flashing rear red led lights before they became legal. It is possible therefore to be illuminated like a Christmas tree,visible to all, and still be riding "illegally".
Steve