Thanks to Brian for his help with th ID.
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Its got the look of T. sowerbyi...not a slug i encounter that often.
Had a look here, and it appears they are ubdecided too. I will however put it up as you suggested as a Tandonia species.
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Yes, definitely Tandonia, and it does look very like sowerbyi, but I'd not be absolutely sure from above unless it was very large.
Yep it was quite long, 70+ mm pushing 80 mm. Hope that helps..
Yes, I think that confirms it as sowerbyi: I rarely see budapestensis as long as 6cm, and it's rather pale for budapestensis too, plus the keel is sticking up toward the tail tip, which I don't think you'd see in budapestensis,
Lat/Lng: 53.2055, -0.5631
OS grid ref: SK960685
Backies woods, Boultham Moor, Lincoln.