The new unit had the following organisation:[1][2][3][4][5][6][7] In February 1939, the existing AA defences came under the control of a new Anti-Aircraft Command.

[6][9][10] The regiment supplied a cadre of experienced officers and men to 236th LAA Training Rgt at Oswestry where it provided the basis for a new 551 S/L Bty formed on 16 January 1941.

[1] On 19 March 1942 the regiment was joined by 516 S/L Bty from 71st (East Lancashire) S/L Rgt,[1] and the following month 59 S/L Rgt was transferred to the Orkney and Shetland Defences (OSDEF) under AA Command, serving on Orkney to protect the Royal Navy's base at Scapa Flow.

[1] On 7 April 1943, while it was based at Holywood, County Down, the regiment was given a new role and title as 148th (Warwickshire) Light Anti-Aircraft Regiment, Royal Artillery, with the following organisation:[1][3][6][7][17][18][19] From 2 March 1944, 148 LAA Rgt served with 61st Infantry Division (a training formation in Eastern England) for the remainder of the war.

RHQ was then joined by three other batteries on 15 August 1945:[17] (During the war both 11 and 56 LAA Btys had served under 178th HAA Rgt in the Faroe Islands garrison.