I do have permission on one big estate Rolf, no shooting of game is allowed here, its all hawking, as much as I love my wildlife, I have found it interesting to watch, and the prey has a better chance of escape.
I have no chance of getting permission to detect on the shooting estates, probably due to what you say, I do shoot myself tbh (stop it you comics lol) (legal power air rifle), but only rabbits that I will eat and I will never take more than we need,
The Wakefield project with red kites , just up the road from me, was doing very well the last time I checked, some peeps even had model planes keeping tabs on them.