Scathophaga stercoraria, commonly known as the yellow dung fly, Shabden Park, Surrey

 Shabden Park  was glorious this afternoon with newly born lambs and their mothers.  And lots of dung means lots of yellow  dung flies, Scathophaga stercoraria.

 What fascinating flies these are: males with golden hairy legs and the much smaller highly promiscuous females mating on the romantic setting of a sheep dropping.

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 Above a mating pair.

Their life cycle is extraordinary and well explained on Wikipedia: see https://en.wikipedia.org/wiki/Scathophaga_stercoraria