Small bomb-shaped animal. Double tufted tail. Brownish. Long antennae.
No interactions present.
Is it definitely an animal? Looks quite like a seed or bit of vegetation from the photo.
I've looked at it at maximum size now. Definitely a copepod, probably Cyclops sens. lat. but I can't rule out other genera.
Thanks, John for that. Other copepods I'd posted had egg sacs, so looked rather different.
Lat/Lng: 51.2953, 1.0671
OS grid ref: TR139595