Shy,
A couple of weeks ago while driving through Dunstable on my way to Newbury....the Plod were doing something that involved their helicopter.
The helicopter was hovering OGE at about 400 feet AGL....and did so for quite some time.
That would have put the aircraft into a very precarious position for several reasons....and is a normal Police Operation.
Now if we are talking routine patrol operations....done in a Twin at some weight that allows OEI flight back to base....then fair dinkum.