Sunbury-on-Thames Urban District

From the Wikipedia page

Sunbury on Thames - also known as Sunbury - was a local government district from 1894 to 1974 around the town of Sunbury-on-Thames, also covering Littleton and Shepperton.

In 1894, under the Local Government Act 1894, Sunbury on Thames was created an urban district of Middlesex. It originally covered just the parish of Sunbury, and added the parishes of Shepperton and Littleton in 1930 with the abolition of the Staines Rural District.

The Royal Commission on Local Government in Greater London considered the district for inclusion in Greater London. However in 1965, when Middlesex was abolished and its former area transferred to Greater London under the London Government Act 1963, the Sunbury on Thames Urban District was instead transferred to Surrey.

In 1974, under the Local Government Act 1972, the urban district was abolished and its former area was combined with that of Staines Urban District to form the present-day borough of Spelthorne.