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Why not enter Hydra as an ID? Yours would appear to be the first observation of these lovely animals on iSpot.
University of Edinburgh and Biodiversity Observatory (OU)
It was also called Chlorohydra viridissima for a while, just to make sure you noticed it was green, but I think it is back to just Hydra now.
I have had green Hydra suggested as an ID on two sites now, but I think some of the green seen on the photo may be an artefact of the photograph. They seem more greyish in real life. I will try to get a truer picture tomorrow in daylight.
Lat/Lng: 54.2660584, -0.4895701
OS grid ref: SE984866