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I've checked Stubbs (just as well I did!) and your fly is not N uliginosus, but the very similar N notatus. It is N notatus that has the distinctly triangular shape of the white patches on the face and a less projecting snout. N ulginosus has a more projecting snout and parallel bars on the face. You can clearly see the difference if you look at the link Erik provided, which is N uliginosus.

Sorry my memory jumbled the characters earlier.