Pale Stagshorn Calocera pallidospathulata
This tiny species was not discovered in Britain until 1969 and was first described scientifically in 1974. It is now known to be quite common, although I’m not sure if I had seen it before.
Finding the focus on such translucent to transparent subjects is tricky.
Olympus EM-1 (aperture priority), Olympus 4/3 x2 TC, Olympus 4/3 50mm f2 macro,1/13 at f8 ISO 1600, hand-held.
The stereos are crosseye.