@Andy 1886 wrote:
If I decorated my car in the same fashion, do you think NW Police would allow it?
The short answer is no. However, you could probably get away with it if you were a bona fide Security company AND were registered with the SIA (Security Industry Authority).
Just as an aside to this, any person working as a “Security Officer” or Doorman MUST clearly display their SIA licence at all times. (It looks like a credit card, has the licence number, expiry date and a photo of the licenced person, and is usually hung on a lanyard around the neck or worn in a plastic cover on the arm.) Anyone working without displaying a valid licence is committing an offence and so is the person employing them.