Seen on ragwort between a field of maize and a wooded edge to mature gardens.
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Did you mean to call this arbustorum? That is the species of Eristalis which lacks a dark facial stripe.
Edit: Clearly you did...you have changed it!
My Flickr photos...
Thanks for looking Ophrys - I do hope it's actually arbustorum.
I struggled a lot with the key, hence my initial confusion, as photos are so often insufficient, especially mine.
Many thanks in any case,
Lat/Lng: 51.222, 0.3381
OS grid ref: TQ633495