Hi wellies
Sorry to hear things have not been going smoothly just recently for you with your sheep! -- that's animals for you!
I had a young ram last year who suddenly went lame on his front foot ....... I could not see any thing wrong no swelling or footrot, but on the front of his hoof I found a long crack from top to bottom.
The crack was very fresh and clean .I remembered that somewhere I had read that during the 2 World War soldiers injuries had been successfully "Glued" back together with Superglue
so did exactly that to the split hoof --- I held it tightly together and dribbled some superglue down it, also gave ram "shot" of antibiotics.
The ram got sound very quickly and the crack healed brilliantly!- maybe this treatment is a bit unorthodox but I thought I would just share it with you.
Good luck with your sheep
Tilly