The town was granted a charter of incorporation to become a municipal borough in 1903. The granting of the charter was celebrated by a public holiday in the town on 2 September 1903. The charter was brought by train to Bromley South station where it was handed to the charter mayor. The mayor then rode in procession led by units of the Royal Horse Artillery and the Royal West Kent Regiment, accompanied by mayors and mace bearers of boroughs in Kent and the County of London and watched by an estimated crowd of 20,000. A sports day and carnival was held at Queen's Mead. Under the charter a town councilconsisting of a mayor, six aldermen and eighteen councillors replaced the UDC. The council was initially based at the old Town Hall in the Market Square but moved to a new Town Hall in Tweedy Road in 1907.
Boundary changes
The area of the borough was increased in 1934, when a county review order added parts of the abolished Bromley Rural District. The council was subsequently enlarged to seven aldermen and twenty-one councillors. In 1965 the municipal borough was abolished by the London Government Act 1963 and its former area transferred to Greater London from Kent. Its former area was combined with that of other districts to form the present-day London Borough of Bromley.
Borough council
The borough council was initially controlled by independents, with a handful of Labour party councillors forming an opposition group. There was a single Communist councillor from 1945 to 1947. The Conservative Party began to contest elections in 1947, and gained a majority in 1950. At the final election prior to abolition the Conservatives lost their overall majority with 14 councillors and aldermen against 6 independents, 4 Labour and 4 Liberal members.
Coat of arms
were granted to the borough by the College of Arms on 19 April 1904. The blazon was as follows: Quarterly gules and azure, on a fesse wavy argent three ravens volant paroper, between in the first quarter two branches of broom slipped of the third, in the second a sun in splendour, in the third an escallop shell or, and in the fourth a horse forcene argent. Crest: On a wreath of the colours, upon two bars wavy azure and argent, an escalllop shell as in the arms, between two branches of broom proper. The sprigs of broom were in allusion to the name "Bromley". The silver wave bearing three ravens represented the River Ravensbourne, while the sun was for Sundridge. The scallop shell was derived from the arms of the diocese of Rochester, granted the manor of Bromley at the time of King Ethelbert. The arms were completed by a white rearing horse, the emblem of Kent. The Latinmotto adopted by the council was Dum Cresco Spero or "While I grow I hope".
