There were 4 species of hoverfly, Eristalsis tenax (Drone Fly) the most common (about 20 or so at any time), a few Scaeva pyrastri with their very distinctive white comma shaped markings, a couple of Episyrphus balteatus (the Marmalade Fly) which can be identified by the double black bands on each tergite, and a fourth species which I didn't manage to id unfortunately. Both S pyrastri and E balteatus are often migratory species which breed in the UK. E balteatus is also notable for variable colour. Darker specimens mean the development of the larval stage was in relatively cool conditions, and sure enough the specimen below was comparatively dark.
|Episyrphus balteatus (Marmalade Fly)|
|Eristalsis tenax (Drone Fly)|
There were also quite a few Yellow Dung-flies (Scathophaga sp). I gather these are normally predatory on other insects, but in this instance it appeared to me that they were nectaring rather than hunting.
Also feeding were a single Bumblebee, a Vespid wasp and a Red Admiral butterfly. Not bad for mid December!
Nigel - this is the Bumblebee!