Hoverfly with a bee-like appearance.
No interactions present.
It looks like it might have a parasite between the thorax and abdomen.
I don't see a parasite. The yellowish hairy hemispherical swelling is the scutellum, and quite normal.
recording wildlife with The Recorder's Year on www.hbrg.org.uk/TRY.html.
Lat/Lng: 51.372, 0.0117
OS grid ref: TQ401655