Noticed when I was doing the butterfly shots there was a dronefly nearby. Eventually decided to take a look as it seemed slightly smaller, darker and shinier than usual. Was amazed to see it was a speckled eye dronefly when I got it in the viewfinder. Never seen one of these before. Not all the best angles but i just wanted to make sure I got some shots of it .
Guessing it's Eristalinus sepulchralis