Me = blue car
Police car = red car
Please excuse my basic MS Paint skills but I had an altercation at the weekend with a Police officer regarding this and I'm still not 100% sure about who was in the wrong.
Basically we both approached the end of our roads which were both give way (as above diagram). However I arrived at my junction slightly before the Police car opposite and the road was clear both directions so I began my maneuver to turn right onto the main carriageway. I had been indicating right approaching the end of the junction. As I was pulling out of the road the Police car began to pull out to the left and promptly beeped his horn at me. I had to stop on the main carriageway to avoid a collision but I had no choice but to carry on otherwise I would have been blocking the road.
Then on came the blue lights and I was pulled in. The Police officer was obviously having a bad day and wasn't in the mood for any kind of conversation regarding the maneuver. The Police officer said he had right of way because I had to cross his carriageway.
Nothing became of it as the car was fully road legal and it was a total waste of his and my time.