Tenthredo livida
Only the first one shown below was examined in the hand but I think the other two are safely identified by the bicoloured pterostigma visible in photos.
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Tenthredo livida, North Elmham Cathedral Meadows (Norfolk, UK), 15th June 2018
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Tenthredo livida, North Elmham Cathedral Meadows (Norfolk, UK), 25th May 2018
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Tenthredo livida, Alderford Common (Norfolk, UK), 22nd June 2014