Just to get your replies started!
We have a small flock and lameness occurs mainly as a result of chafing in the cleat caused by long grass on some of our rented in grazing land. Foot rot is rare but in all cases we treat sheep individually and not en-masse. Should foot rot arise those are seperated out for a while and given the 'magic' blue Alamycin or Tetramycin. Injections are only rarely needed.
We do however ensure that the flock has constant access to multi mineral licks and, once a year, to the Denis Brinicome foot lick. (I've forgotten its name) But as a result, soft hooves are a thing of the past.
We last ran them through the foot bath eight years ago.
However, those farmers with commercial flocks cannot afford the time to conduct their businesses the way we conduct ours. Their tasks are, in so many ways, much harder than ours.