The wall is at an interesting spot, it's on the boundary between a solicitor's office and a halal butcher/convenience store, the parking area is, by day, filled with Aston Martins, convertible Mercedes, Jaguars and other top end sets of wheels and behind is the normally open door giving a view in to the halal butchery. I've no idea as to whether the butcher or a solicitor left the mug on the wall.
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[original upload 20161219]