On Friday afternoon, the shelves had been stripped bare. A handful of green Deutsche Bundeswehr T-shirts hung on a chrome rack. Several pairs of high-tech goggles remained at the glass cashier counter as a long line of customers trailed to the back of the store, clutching deeply-discounted finds: new crimson polo shirts emblazoned with the logo of the Royal Mail, heavy grey Swedish Army jackets, and used green woolen trousers.