As Tim says, the accent is always on safety. Dangerous shooting might result in being told to leave at the very least; shoot over for the violator. Can be a bit mesmerising for someone who has never shot driven game when the sky is suddenly filled with birds. Don't worry about an easy bird as the next second a couple of good sporting ones will come over. Relax and pick the shots carefully. The game is not to kill everything but to behave in a sportsman like manner. I often pick up behind the shooting line with the dogs and nothing is worse to see than the gun who has a bang at everything sending wounded birds back or smashing to pieces a close one.
Eugene, interesting that you also used Derek as a Gunsmith. It always beat me how he could find anything in that workshop of his; a bit like Tutenkahmun's tomb after an earthquake had hit! Lagopus.....