On spear (sorry, creeping) thistle, in grassland by River Medway.
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Really nice set of photos, David. Quite different to quadrifasciatus when you see a male as well as this.
PS: Looks like Creeping Thistle, a favourite of Conopids. Spear Thistle never seems to attract them, in my experience.
My Flickr photos...
Bother, creeping thistle of course is what meant, I got over-excited by the Conops !!! I'll see if I can edit it.
Lat/Lng: 51.190775, 0.244901
OS grid ref: TQ569459
Haysden Country Park by the River Medway shallows.