And how many people have been taken to court and fined for this "breach of lighting regulations"?
Probably because most of us realise that it is stupid and don't do it.
Then of course there for the very few stupid enough to do this - thereis the Vehicle Defect Rectification Scheme where a driver of a vehicle is given a short period of time to correct a vehicle fault and this is applied to bicycles as a common sense measure
So chances are with a 99.9% with common sense, and the matter of the stupid few dealt with as a rectification, the number of cases actually going to court are not going to be many