The Amalgamated Society of House Decorators and Painters (ASHDP) was established in 1872. It emerged from the struggle over amalgamation versus local independence of several London societies which had formed a loose federation, the General Council or General Association, in 1865. Dissatisfaction with the weakness of the General Council led to the formation of the London General Association of Amalgamated House Painters (GAAHP) in 1866 which merged with the General Council to form the Amalgamated Society of House Decorators and Painters in 1868. The first society failed rapidly, according to its secretary because of over-generous benefits. The second society emerged in 1872. It took over the East London Painters' Union and the Universal Federation of House and Ship Painters and Painters' Labourers Union in 1900. In 1904 it amalgamated with the Manchester society, by then known as the National Amalgamated Society of Operative House Painters and Decorators to form the National Amalgamated Society of Operative House and Ship Painters and Decorators (NASOHASPAD).
Reference: R.W. Postgate, 'The builders' history' (London: National Federation of Building Trade Operatives, 1923).