The regiment was formed on 27 February 1941 as part of the rapid expansion of Britain's Anti-Aircraft (AA) defences.
A number of officers, including the Commanding Officer (CO), Lieutenant-Colonel John Anderson Armstrong, and the adjutant, Captain Sir Charles Shuckburgh, Bt, came to the regiment from the 11th (City of London Yeomanry) LAA Rgt within 49th AA Bde [REF].