A very large, wasp-like, hoverfly. 15-20mm long.
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Where is the name Bog Hoverfly coming from? That has always been applied to the rare Eristalis cryptarum.
My Flickr photos...
I'm quite glad to have got the latin ID as this fly is new to me. Anyway I got 'Bog Hoverfly' from the NatureSpot website (Leicestershire & Rutland) - link below:
This is the trouble with people adopting a name unofficially, and also a great example of why we don't need common names...the scientific name does the job without any confusion!
I'd forget the Bog name, personally, for Sericomyia. I see it a lot, and I hardly ever visit a bog!
Lat/Lng: 54.6, -6.03
OS grid ref: NW398302