The allotment crew are ex battery hens, I take that to mean they were caged.
My point is, it might also be relevant to ask what sort of egg farm do hens come from? I know of at least one egg farm with very high standards of hen care: free ranging on pasture. Those hens would be worse off if they were "rescued" into crowded, muddy conditions.
PS I'm not thinking of breeding decisions here (or male chick disposal), only hen care. Personally, I can't support the jump from "need to make profit" to "selectively breeding so hens lay fast and die young" nor "kill most of the male chicks"