The only lights to show to the front are white or yellow, they are way to blue to be legal.
I used to think that was the case but seemingly, blue LEDs are allowed as long as the do not move/flicker - thus giving the impression of a police car.
However, because these (in the OP) are placed into the sides then they are considered illegal because the obligatory lights are supposed to be white.
You can get away with a tinge as many high power lamps have said tinge to them.
It really is a pity that the law isn't tightened to ensure everyone knows where they stand.
I believe it should be black and white - only lights allowed in/out or under are as provided (- which would also allow for white LED DRLs) by the manufacturer.
That is...
Static white to the front (and rear only for reversing - which must activate via reverse gear).
Flashing yellow to front, sides and rear - only to indicate intention to turn
Static red to rear to indicate braking and travelling in inclement weather - that is, visibility must be less than 100 metres.
Both front and rear fog lights should only be able to be activated alongside dipped beam only and with an accompanying light on the dashboard.
Fog lights only to be used in inclement weather - heavy rain, thick snow or fog etc and only when visibility is below 100 metres or the distance between x lampposts.
All lamps must be replaced on a like-for-like basis - in other words, if it came with tungstens, you fit tungstens - unless the lighting assembly is correctly uprated.
If this was the law and incorporated into the highway code - and made part of the written test then every driver who passed said test would have read the section and answered a question on it - so no excuse.
The only exceptions are vehicles designated as emergency vehicles - and these must be registered as such.
Recovery and works vehicles such as road repair would be allowed amber beacons due to their specific registration, as would a green beacon on a doctor's car.
