Overall about 15mm.
No interactions present.
Definitely a midge in family Chironomidae, but I think there are a number of species that look similar to C. plumosus and I don't know whether it is possible to confirm the species.
Entomologist and biological recorder
Lat/Lng: 50.8697, -1.7843
OS grid ref: SU152078
In bird hide overlooking Ivy Lake