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I'm not certain about this, but I think it could be the Great Pond Snail, Lymnaea stagnalis. I used the Conchological Society's online key to try and work it out, have a go yourself and see if you agree:
There's some more information on these smails at:
Entomologist and biological recorder
Thank you for the websites,you were right,it was a great pond snail.The website helped us to identify another of our finds,some pond snail egg sacs!
Lat/Lng: 53.465066866632, -2.2487149536937
OS grid ref: SJ835965