Thanks THECORBYLOON
I've seen documentaries on how 'fractious' waiting rooms can get, especially at the weekend, but I maintain that in the circumstances described, security personnel should have focused on the removal of anyone who had issues with Sergeant Prendeville, rather than the other way around.
In fact, if this story is indeed accurate (as reported), in Sergeant Prendeville's position, I would have simply said, "I'm fine here...if others are bothered by my uniform, I suggest you deal with [them".