Update: partial success. No hedgehog, but badger investigated, got its head inside, then lifted its head, banged it on the roof and fled in fear.
Came back and had a look, but didn't try again. The slate is very heavy, but I may need to lay another slab across it to add yet more weight.
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Saw a couple of Stonechats today the below was the best picture I could get .
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Then more caterpillars and on closer inspection they all have two red spots on there back .
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Then This white moth and a rather nice butterfly that I need to identify.
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@midlife get one you will be surprised at what you get walking around the garden.