Post World War I, a policy of amalgamation was encouraged by the Trustee Savings Bank Association. The London Savings Bank had already acquired the Brighton Savings Bank in 1917 but the latter seceded in 1920. However, the Southampton and the Guildford Savings Banks joined the London Savings Bank in 1919. Gradually, the London TSB extended west to Newbury, south west to Southampton and south east to Rochester. The mergers continued into WWII with the addition in 1941 of the Luton and District Trustee Savings Bank. By then, only two London savings banks remained and in 1942 the London Savings Bank merged with the Finsbury and City of London Savings Bank under the title of London Trustee Savings Bank.[3]
The Finsbury Savings Bank, as it then was, opened in August 1816 in St. John's Square, Clerkenwell Green, Islington. It began in only a small room in a house where “a few people gathered together to form a savings bank for small tradesmen, labourers and servants.” Despite its reputation as a small establishment for poor people, Finsbury had some well-known customers, including Charles Dickens. In 1841, Finsbury moved impressive new premises in Sekforde Street [4] Like the London Bank, in the early twentieth century the Finsbury spread out from London, reaching Bedford, High Wycombe and Gravesend.[3]
The two banks were similar in size. The 1935 Trustee Savings Year Book gave London as number 16 by size with 31,000 active accounts, 13 branches and £4.2 million funds. The Finsbury and City of London Savings Bank was number 21 by size with 20,000 active accounts. 8 branches and £3.0 million funds.[5] At the time of the merger, funds were given as £20 million and in 1944 the enlarged bank ranked number 8 in the country, well behind northern and Scottish savings banks.[1]
In 1951, a new head office was opened for the enlarged bank on the corner of Cannon Street and Queen Street.[6] In 1971, the London Savings Bank merged with the South Eastern Trustees Savings Bank, to form the London and South Eastern Savings Bank. The new bank had 123 offices and funds exceeding £250 million. Following the Trustee Savings Bank Act of 1975 which encouraged further consolidation, the London and South Eastern Savings Bank became part of the TSB of South East.[3]