 On the southern bank were the counties of Wiltshire, Berkshire, Surrey and Kent.The 214 bridges and 17 tunnels that have been built to date have changed the dynamics and made cross-river development and shared responsibilities more practicable.In 1965, upon the creation of Greater London, the London Borough of Richmond upon Thames incorporated the former 'Middlesex and Surrey' banks, Spelthorne moved from Middlesex to Surrey; and further changes in 1974 moved some of the boundaries away from the river.