Harry the Horse is the Laundry's in-house armorer. Supplier of regular civilian weapons as well as protective wards and Hands of Glory among other arcane weaponry.
First appearence in The Atrocity Archives
He's an ex-cop or ex-soldier or ex-something that allowed him to acquire an alarming amount of expertise about killing people in the course of his profession. He hangs out in a cubbyhole in the basement, with a walk-in gun safe and firing range. - The Rhesus Chart page 134
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