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 for an invasion of England. Walsingham's recruitment of Anthony Standen, a friend of the Tuscan ambassador to Madrid, was an exceptional intelligence triumph and Standen's dispatches were deeply revealing. Walsingham worked to prepare England for a potential war with Spain, in particular by supervising the substantial rebuilding of Dover Harbour, and encouraging a more aggressive strategy. On Walsingham's instructions, the English ambassador in Turkey, William Harborne, attempted unsuccessfully to persuade the Ottoman Sultan to attack Spanish possessions in the Mediterranean in the hope of distracting Spanish forces. Walsingham supported Francis Drake's raid of Cadiz in 1587, which wrought havoc with