Front lamps of a vehicle including push bike must be white and permanently on, it must not flash unless it is an emergency vehicle.
Likewise the tail lights must be red and also not flash.
The only lamps allowed to flash are the indicators and they have to be amber (not yellow).
http://www.legislation.gov.uk/uksi/1989 ... tents/made
The police don't mind flashing pedal-cycle lamps because at least they have lights. Police priority is protect life, protect property, uphold the law, in that order.
Interestingly, a (push) bicycle _must_ be lit at night, and it does not matter whether it is on the road or on the pavement (footpath/sidewalk). [mutter, number of times I've nearly collected an unlit bike as a bonnet mascot].
I ride bicycles too, only I need the lights to see where I'm going, strobing things give me a headache.
btw I'm licensed for bikes, cars and lorries and had to take what amounts to advanced test every few years due to nature of goods carried.
Imo any lorry driver who doesn't know there's a bike up his inside is a complete idiot.
The first daylight running lights (DRL) on a car were probably the Volvo 240 and shone through over 270° arc, around the corners of the car and visible from any direction. Intended purpose be seen. Swedish idea, copied in Finland no doubt (and the same again in swedish). Not 100% but their 'lights always on' rule doesn't mean the main headlamp.
But, but but they've changed the design of DRL so that they emit pencil beams forwards. Imo these LED things are useless because they dazzle and far better to use fogs instead because they are wide, low and flat so they can't dazzle (original purpose is to cut dazzle in fog after all), unlike DRL and Xenon (HID) headlamps which are fantastically bright for night. Plus most fogs can easily be adapted as DRL.