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Looks like arbustorum or horticola , i think you might need the face to discount one or other - nice crisp images - cant see no tenax
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The individual fly in the second picture is not tenax, as the base of the hind tibia is pale. A few of those on the umbellifer are arbustorum, with pale face, orange sides to tergites 2 and 3 and dark on mid tibia.
pertinax and arbustorum are the common ones where I am, at the moment. tenax tends to peak a bit later in the autumn.
My Flickr photos...
Thanks, everyone. This is more complicated than I had realized. Can you suggest a good website and or book for hover flies?
University of Edinburgh and Biodiversity Observatory (OU)
The best website for reliably identified hoverflies is this...
The best book is British Hoverflies by Stubbs and Falk. Out of print, but you might get it second hand and it must be due for a new edition before too long.
There is a Wildguide to Hoverflies coming out soon, covering many, but not all species. It should be well worth getting!
Great. Thanks. I'll look out for the Wildguide.
Lat/Lng: 51.146597222222, -2.7043527777778
OS grid ref: ST508388