Unfortunately, I've worked in the vehicle graphics industry in the past, doing lots for Police and Emergency Services vehicles. The main coverall for reflective colours etc sits under the Vehicle Lighting Regulations.
In there, there are the rules about reflective yellows, blues and lighting colours etc. They're very clear that only emergency service vehicles can use the designated schemes & colours for front and rear graphics and blue lights, but there is an option for an approved special "dispensation" that can be applied for and received in writing (for private ambulances, blood bikes etc).
Enforcing the Vehicle Lighting Regs seems very low on the Police priority list.
We had customers ordering Police style graphics packages in the mistaken belief that if they didn't have the word "Police" on the car, they weren't breaking the law. Under our ISO QA schemes, we had to record our actions when anyone asked us to design or supply schemes that were illegal - our normal response was to point out the illegality and confirm that we couldn't supply. This usually resulted in buyers telling us that we were being unhelpful and they went to the less "reputable" on line suppliers who would do anything for money.
I'd have always liked to have helped, but we supplied many of the UK's Police forces and Ambulance/Fire services etc - and to maintain our accreditation we had to be lillywhite about our quality systems and compliance, so we just couldn't do it.
Unfortunately, some of our competitors were less "honest" and lots of bikes/cars are now running around with "illegal" reflective graphics (imitating Emergency Services vehicles) - and I must say, I'm glad when the "imposters" get pulled.
We need to make sure people always pull over for Emergency vehicles and don't think "here's just another w*anker with fake lights etc" and fail to let the, through.
One day, an ambulance or a police car could save my (or family/friends) life, so I'm all for making sure they're never mistaken.
Hi Viz clothing though - I'm all for it 😀