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I think this probably is N. antennina but I have never seen it out of the water so can't be sure.
If it is, then it is a hydriod (an animal) it should probably be in, er, Invertebrates?
It might be worth re-posting in the correct group where more specialists will look at it.
Lat/Lng: 52.97823, 0.761
OS grid ref: TF854458