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Thanks for the ID, don't know if you saw my other slug post:
As I lack a field guide to slugs, most of my ID's are, at best, educated guesses.
The AIDGAP key to slugs, with the illustrations from the Collins field guide, is available to download from:
It was published in 1983 and is a bit out of date, with a couple of species missing. Just click on the title or authors and you get a pdf.
Lat/Lng: 54.28534, -0.56504
OS grid ref: SE935886