 The Type 21 Convoy was removed in August 1955 and replaced by a Type E Convoy.The technical equipment of the now enlarged unit comprised six radar aerials, (three Type 13s, one 14 Mk 7, one 14 Mk 8 and one Type 15), two RV 10 Control Centres, four RV 540 Cable Carriers, three diesel-powered alternator sets RV 550 and VHF facilities.Each Control Centre contained two PPI consoles, two range/altitude consoles, aerial controls, fighter plotting board and communications.