Little is known of the origins of the London Unionist Members' Committee. The single volume of minutes of this committee which has survived is annotated 'Presented by Sir George Bull, Bt, December 1960.' Sir George Bull was the son of Sir William Bull, who as MP for Hammersmith (1900-1918) and then Hammersmith South (1918-1929) regularly attended its meetings, which was open to all London Conservative MPs and, during the Wartime coalition, also Liberal. Bull was elected Secretary and Treasurer of the committee on 26th February, 1906, and this is likely how the volume came to be in his possession.

The first minutes of this volume refer to the committee being re-constituted in February 1906, so it is likely that it was in existence well before this date. Although its terms of reference are not described, its purpose was clearly to discuss issues affecting the metropolis as a whole amongst those Conservative and Unionist Members who represented it. The committee also received deputations to hear grievances, for instance, a deputation of small munitions forms complaining that they faced bankcruptcy due to the failure of the Government to supply them with raw material, on 9th August, 1916. It met irregularly, with intervals of between several week and several months between meetings.