A Biodiversity Information System for Cheshire, Halton, Warrington & Wirral

Large Slug ID:
Recently saw a website indicating Spanish Slug (Arion vulgaris) had arrived and wanting citizen scientists to add data. I found a large slug in my back garden which looked similar to photos of the Spanish Slug but am not sufficiently knowledgeable to separate this from other similar looking species. Could someone please ID this slug for me ???

Thank you.

[/color]