From the Wikipedia page [1] Orpington was a local government district in north west Kent from 1934 to 1965 around the town of Orpington. It was created an urban district in 1934 from parts of the abolished districts of Bromley Rural District and Chislehurst Urban District, taking in the entirety of Chelsfield, Cudham, and Knockholt parishes, and most of Farnborough, part of Keston, most of Orpington, most of St Mary Cray, part of St Paul's Cray and part of West Wickham.