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Thank you so much, barry. I admit to feeling a little overwhelmed, but your post has given me some practical ideas to work with. The horses are difficult. Almost all young, only 2 belong to family and one of those is a foal. They need knowledgeable handling, but perhaps we could find someone to do the letting into field, mucking-out and haynets. My sister lives right on the edge of a branch of Ilkley Moor so it's not very easy to reach, but again, it's probably worth a post on their local facebook page for help in the house. She's also still working 3 days a week doing reception, wages and all the paperwork for the MOT garage they run (nephew is running the practical side). He'll have to step up his act sharpish I think.
I'm so, so sad and feel fairly helpless. It will be good to have some direction to go.