What is "henderson's"

Henderson's, better known as The Bomb Shop, was a bookshop at 66 Charing Cross Road, London known for publishing and selling both radical left and anarchist writing and modernist literature. The shop was founded in 1909, and was a father and son operation run by Francis Riddell Henderson, formerly the London representative of Walter Scott Publishing. The shop was bought by Eva Collet Reckitt, and became the first of the Collet's chain of left-wing bookshops.