Suspended from Alder branches over stream, thin green thread, approx 10cm long and wiggling.
No identification made yet.
No interactions present.
Just looks like a piece of grass that's attached to the plant, possibly by a silk spider thread. Hence the looking like it was wiggling as air currents hit it. That's my best guess anyway.
I agree with Chris!
Entomologist and biological recorder
Lat/Lng: 50.6, -2.1
OS grid ref: SY9581