No interactions present.
Eristalis has the looped vein R4+5 and Volucella has a re-entrant upper outer cross vein, neither of which this fly has. It is a very distinctive medium-sized bee mimic, once you get used to it. It is common on Hogweed, especially, at the moment.
My Flickr photos...
Thanks for the correction. I rushed into the id. a bit! I have seen this species before, but not often.
Lat/Lng: 51.47384, -2.57592
OS grid ref: ST600751