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This looks like a hoverfly.

It moved like a wasp - but it is definitely a diptera: only one pair of wings and halteres.

I have not seen the mouthparts before: It seems to be a cross between the proboscis with a labella [like blowflies and many hoverflies] from the centre of which projects a "tongue" or labellum like a wasp. Unfortunately it has shrivelled as the specimen dried.

Captired: 28 May 2022 whilst it was investigating the cover of a rainwater drain in a suburban garden in Wellingborough, Northants.

15mm long.

Henry