Marmadukes Cafe Deli
22 Norfolk Row Sheffield, S1 2PA, Sheffield, South Yorkshire
100% positive
Directions: Up the stairs and a mint green door in an alcove. It says "whichever" on with a half male half female person sign on.
Comments: You probably have to be a paying customer (I didn't check, sorry) but if in doubt just get a glass of tap water (it's free) and go right ahead. Or just grab a can of Coca Cola or something.