What it is
Bread is several baits. Punch on a canal in winter still sorts roach when maggots feed a million gudgeon. Flake under a bush is a chub bait. Crust on the top is a carp bait. Liquidised bread is a feed.
Use fresh enough bread for flake, slightly stale for punch if you like a cleaner disc. A punch kit is cheap. A whole loaf on a carp lake is a surface session, not a method mix.