Is it illegal to put blue lights on your vehicle?

I’ve noticed that lots of cars, vans and lorries are displaying bright blue lights. Often this is quite concerning especially at night if the vehicle moving through trees it then looks like an emergency vehicle.

Two questions:

1: Is this legal?
2: If not why is it not enforced? It's hardly uncommon and hardly subtle and quite unsettling.

Asked on 13 November 2014 by jgrahampo

Answered by Honest John
1: No.
2: Not enough police.
Similar questions
I have a 4-year-old Volkswagen Polo, which I bought new from a main dealer in Ruislip, Middlesex. It passed its first MOT, but the second time I took it to a different main dealer. He found that the headlamp...
Is it legal to drive a car with lights in the wheel arches and are there any colour restrictions for those lights?
Do I need to have lights on the trailer if used in daylight hours taking things to local tip? Car towing a Freelander so car indicators could be seen over trailer.
 

Value my car

Save £75 on Warranty using code HJ75

with MotorEasy

Get a warranty quote

Save 12% on GAP Insurance

Use HJ21 to save on an ALA policy

See offer