A police patrol car turned right in front of me this morning, when there really wasn't a big enough gap. No blues and twos, no indicators, but I was kind of ok with it.
But then, when round the corner and out of my eyeline, he did a u-turn and pulled out right in front, causing me to slam my anchors on so hard my seatbelt locked up. The side road he came out of is one-way, so you don't normally have to be aware of anyone who might come out of there.
Then he went about 50 yards up the road and stopped just short of give way lines, but he wasn't giving way, he was just stopping. Both officers got out and started running down another side road, so I had to pull out round the car and wait at the give way, with most of my car on the wrong side of the road.
The driver (who was a fat bastard) only ran about 10 yards before he came back, got in the car, and followed me down the road.
I dealt with my rage by singing the first couple of lines of "Laughing Policeman" ("I know a fat policeman/He comes from down your way") to myself.
If they're going to do fast pursuit driving tactics, they should have their flashing lights on, so other drivers no to expect them to do weird things.
Generally, people not indicating and people who block side roads and exits on to roundabouts.