Edited to reflect comments below.
Could be C. nemoralis or C.hortensis
No interactions present.
It's only got about 4 whorls - it could be an immature brown lipped snail C.nemoralis. Did it have a distinct thickened white lip (indicating an adult specimen) or a pale flexible edge to the shell (indicating an immature of either species). Not clear from the image.
BMIG website: www.bmig.org.uk (centipedes, millipedes & woodlice)
BMIG Newsletters ~ www.bmig.org.uk/view/resource/bmig-newsletter
BMIG Bulletins ~ www.bmig.org.uk/view/resource/bmig-bulletin
Thanks for the comments, Steve. The photo isn't one of my better ones. I have a second one which is no better. It was certainly smaller than the C. nemoralis and located fairly close by. The lip wasn't distinctly thickened. So does rather look like it could be either of the two.
Lat/Lng: 53.0, -1.5
OS grid ref: SK3747