weather station held the UK July record high of . Settlements Surrey has a population of approximately 1.1 million people. Its largest town is Woking with a population of 105,367, followed by Guildford with 77,057, and Walton-on-Thames with 66,566. Towns of between 30,000 and 50,000 inhabitants include Ewell, Esher, and Camberley. Much of the north of the county, extending to Guildford, is within the Greater London Built-up Area. This is an area of continuous urban sprawl linked without significant interruption of rural area to Greater London. In the west, there is a developing conurbation straddling the Hampshire/Surrey border, including the Surrey towns of Camberley and Farnham. Guildford is often regarded as the historic county town, although the county administration was moved to Newington in 1791 and to Kingston upon Thames in 1893. The county council's headquarters have been outside the county's boundaries since 1 April 1965, when Kingston and other areas were included within Greater London by the London Government Act 1963. The administration moved to Reigate at the start of 2021. History Ancient British and Roman periods Before Roman times the area today known as Surrey was probably largely occupied by the Atrebates tribe, centred at Calleva Atrebatum (Silchester), in the modern county of Hampshire, but eastern parts of it may have been held by the Cantiaci, based largely in Kent. The Atrebates are known to have controlled the southern bank of the Thames from Roman texts describing the tribal relations between them and the powerful Catuvellauni on the north bank. In about AD 42 King Cunobelinus (in Welsh legend Cynfelin ap Tegfan) of the Catuvellauni died and war broke out between his sons and King Verica of the Atrebates. The Atrebates were defeated, their capital captured and their lands made subject to Togodumnus, king of the Catuvellauni, ruling from Camulodunum (Colchester). Verica fled to Gaul and appealed for Roman aid. The Atrebates were allied with Rome during the invasion of Britain in AD 43. During the Roman era, the only important settlement within the historic area of Surrey was the London suburb of Southwark (now part of Greater London), but there were small towns at Staines, Ewell, Dorking, Croydon and Kingston upon Thames. Remains of Roman rural temples have been excavated on Farley Heath and near Wanborough and Titsey, and possible temple sites at Chiddingfold, Betchworth and Godstone. The area was traversed by Stane Street and other Roman