I had to move out of the way for a police car with its "blues and twos" on at the top of Grapes Hill in Norwich which is at a roundabout. There was nowhere for me to go but on the roundabout as thier were cars to my left. So I stopped on the central reservation to let the police car through, I was never pursued or even given a fine of any kind.
Doing so may have been illegal, however, I only did it to let the police car through, and no other. Thus in my view, I did the right thing.