Used to happen quite a lot when I fished Ladybower. I've regularly seen old members using pellets and I once saw I guy fishing the river, up above the Gusher, hammering out trout after trout in between lacing in handfuls of maggots.
His girl-friend was landing the fish and filling a black bin liner with them. I saw him catch 4, just while I was driving past, and they were there all evening!!!
I reported them to Purnell but they were there again the following couple of weeks
We've had members at Wharncliffe using bread and sweetcorn then boasting about what they've caught. I suppose we all hold differing opinions on what constitutes fly-fishing