Afternoon walk in Knighton Wood, Essex. I nearly walked into what looked like egg sacs which were hanging on a beech leaf at head height. No idea what they were. They were a clump of 6 transparent ribbed cases, each containing many small white larvae which looked flat with a brown head. They weren’t moving.
Thanks to the brilliant identification team at the Natural History museum I had my answer in a few minutes. They are Caddisfly eggs, probably Glyphotaelius pellucidus.