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Don't think it is Limax maximus as this slug does not show any sign of a keel. Also the mantle has two bands which I think is not present in L. maximus.
Wrong group - should be in 'Invertebrates'
Still in the wrong group.
Both photos show the breathing-pore beautifully. It's toward the rear of the mantle, rather than in front of the mid-point, which rules out the Arion slugs. The right photo shows the fingerprint-like pattern of ridges on the mantle, which makes it Limacidae.
Lat/Lng: 53.37699, -2.4674
OS grid ref: SJ690867
Found on wall in kitchen