I'm lucky, i can spit from my front door onto a shoot with a good population of woodcock and have free reign.
Not sure mate, down to a lot more than the bird. Driven grouse in a proper wind is always a tough one, as is woodcock walked up over dogs in some of the thick boggy forestry round here, because the birds are twisting up through the trees you rarely even have chance for a shot. Low light flighting teal into woodland ponds is tough. Ummmmm. . . . some of the very high pheasants where you need a good long barrel, heavy shot and a hell of a lot of lead maybe.
Easiest shot would