Chislehurst its earlier format corresponded to the letters IMP (for "imperial"). The Chislehurst civil parish formed an urban district of Kent from 1894 to 1934. In 1934 it became part of the Chislehurst and Sidcup Urban District, which was split in 1965 between the London boroughs of Bromley and Bexley. The Walsingham family, including Christopher Marlowe's patron, Sir Thomas Walsingham and Queen Elizabeth I's spymaster, Francis Walsingham, had a home in Scadbury Park, now a nature reserve in which the ruins of the house can still be seen. A water tower used to straddle the road from Chislehurst to Bromley until
Thomas Walsingham (literary patron) with Poley present, purportedly in a dispute over an unpaid debt. Poley later became an important, secret intermediary in clandestine arrangements for installing Elizabeth's putative successor, King James. Francis Walsingham made use of his young relative as early as October 1580, when he appointed him as one of the trusted couriers between the English court and the queen's ambassador in France. In August 1581 Thomas accompanied Sir Francis to Paris on a delicate diplomatic mission connected with the proposed marriage between Elizabeth and the French king's brother, Francis, Duke of Anjou. In 1596 he was appointed Justice of the Peace