"Nark" AOG? Baldric could be! My favourite overheard at a Flying Squad party was: Officer, 6 foot 4 and square, broken nose, not a man you'd wish to meet in an alley in the wrong circumstances, "Hello Charlie. You out already?" Guest " Yes, Jim, I only got a carpet [three years]. Been out 6 months"
Poachers and gamekeepers ! Plainly Charlie was of such use to the Squad, or, perhaps, such a respected criminal (!), that he was invited to their Christmas party. Beginning to wonder how I got there!