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
Francis Walsingham promotion schemes and invested in the Muscovy Company and the Levant Company. He supported the attempts of John Davis and Martin Frobisher to discover the Northwest Passage and exploit the mineral resources of Labrador, and encouraged Humphrey Gilbert's exploration of Newfoundland. Gilbert's voyage was largely financed by recusant Catholics and Walsingham favoured the scheme as a potential means of removing Catholics from England by encouraging emigration to the New World. Walsingham was among the promoters of Francis Drake's profitable 1578–1581 circumnavigation of the world, correctly judging that Spanish possessions in the Pacific were vulnerable to attack. The venture was calculated