Ooooh, that was fun! Thanks Tom!!!
A few nits (here we go)
1. The plate on the front of the car that says "Police" is incorrect. Size is okay, but the lettering is wrong, and the sign should be the same as the number plate, silver letters on a black background.
2. The black and white armband signified that an officer was on duty. It was worn around the cuff, not that high on the sleeve.
3. The helmet is wrong. The straps indicate that this is one from the eighties. In addition, officers wore flat caps in these cars because the wind would blow their helmets off. The helmet, to be more authentic, should have one single strap, resting on the point of the chin. The badge on the helmet should ideally be flat black.
4. The tunic of that era did not have numbers on both collar and shoulder epaulettes. Back then it was the collar only. The numbers did not make the transition to the shoulder until the high-collar tunics were phased out, some time in the fifties.
5. The chain for the whistle goes from the second tunic button into the side of the breast pocket.
Pedantic, aren't I?