High Quality Content by WIKIPEDIA articles! The Ministry of Supply (MoS) was a department of the UK Government formed in 1939 to co-ordinate the supply of equipment to all three British armed forces, headed by the Minister of Supply. There was, however, a separate ministry responsible for aircraft production and the Admiralty retained responsibilities for supplying the Royal Navy. During the war-years the MoS was based at Shell Mex House in The Strand, London.