Mushroom farm, there is one near Roseisle (Elgin) and they sell the used earth for compost so you would get double income. How about a wormery? There is a chap that has one in Nairn and it does great trade for the fishermen. It's no cheap either I think it is £2 for 10 large worms the last time I bought some for my dad.
Local veg would always be a great seller, doesn't need to be anything fancy as long as it is good...
Best of luck whatever you turn your hand too.
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