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The tubercles on its back seem to be all wrong for A. subfuscus. It does have the look of A. owenii?
Yikes, I know nothing about slugs. Could be either, you are right, it does look like owenii...
I think Chris is right, A. owenii - tubercles are flatter in subfuscus and the footfringe more strongly striped.
Seems likely so added ID
Lat/Lng: 52.59, -2.0687
OS grid ref: SO954991
Post-industrial Urban Local Nature Reserve between Walsall and Wolverhampton