▁Section ▁( TA ) ▁ ▁No ▁ 2 2 ▁( Lond on ) ▁C able ▁Section ▁( SR ) ▁ ▁No ▁ 2 5 ▁( Lond on ) ▁Const ruction ▁Section ▁( SR ) ▁ ▁No ▁ 1 ▁( Lond on ) ▁Air ▁Wing ▁Sign al ▁Section ▁( SR ) ▁ ▁No ▁ 1 0 ▁( Lond on ) ▁Air ▁Squadron ▁Sign al ▁Section ▁( SR ) ▁ ▁The ▁first ▁Command ing ▁Officer ▁( CO ) ▁was ▁Lieutenant - Col onel ▁William ▁Fox ▁Bruce , ▁D SO , ▁MC , ▁who ▁had ▁been ▁captured ▁during ▁the ▁German ▁Spring ▁Off ensive ▁of ▁ 1 9 1 8 ▁while ▁command ing ▁ 4 7 th ▁Sign al ▁Company . ▁ ▁To ▁meet ▁the ▁growing ▁threat ▁of ▁air ▁attack , ▁a ▁number ▁of ▁T A ▁units ▁began ▁to ▁be ▁converted ▁to ▁the ▁anti - air craft ▁( AA ) ▁role ▁during ▁the ▁ 1 9 3 0 s . ▁On ▁ 1 6 ▁December ▁ 1 9 3 5 , ▁ 4 7 th ▁( 2 nd ▁London ) ▁Div is ional ▁H Q ▁was ▁red es ign ated ▁ 1 st ▁AA ▁Division ▁( for ▁which ▁London ▁District ▁Sign als ▁provided ▁the ▁communic ations ), ▁while ▁ 4 7 th ▁Div is ional ▁Sign als ▁became ▁London ▁Corps ▁Sign als . ▁London ▁Corps ▁Sign als ▁also ▁admin ister ed ▁ 2 0 4 th ▁Med ium ▁Regiment ▁and ▁ 2 0 6 th ▁Field ▁Regiment ▁Sign al ▁Se ctions ▁( TA ) ▁and ▁ 2