Large hoverfly with buzzy flight.
No interactions present.
Thanks! That's great. I was bothered about the look of the face but didn't have any info on E. arbustorum, so it's good to know this.
Lat/Lng: 51.03766, -1.3505
OS grid ref: SU456266
On blackthorn blossom, bridleway from Oliver's Battery to Yew Hill, Winchester.