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I think it has a white lip in which case its very likely to be C.hortensis (its not 100% diagnostic, apparently). You need to check that the lip is hard and not membranous and soft. If it is, the this is a juvenile and its ultimate lip colour could change. However, the lip of this shell does look opaque and well-formed.
University of Edinburgh and Biodiversity Observatory (OU)
I was once told that the number of "swirls" was a good indicator of whether banded snails were adult or juvenile - 3 or more measured from centre to outside of the snail meant adult! Truth or myth?
Jonathan is correct about shell lips (hello Jonathan).
re Number shell whorls in adult - it depends upon the species! Some snails mature at 3 whorls. Some keep on growing (as immatures) up to 12 (e.g. Clausilia), before developing their shell aperture modifications (which are so useful in species id). Cepaea sp typically mature at around 5 whorls. Yours is at least 4 - may be adult (but 'I can't be certain').
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
Lat/Lng: 53.464909053918, -2.2494238615036
OS grid ref: SJ835964
Community garden with small pond