New trap door!!! I.D please!

Went to local pet shop again today for a nose around, glad i didnt take loads of money! But this little fella had been there ages and no one was intrested in it! I felt sorry for him and thought id grab him and put him in my collection! Pet hole i know but ive started a burrow against the side of the tank, so lets hope he takes on that! Fast little blighters though aren't they!!!

I have no idea what colour/phase it is, so can anyone I.D it please?!