Short S.22 Scion Senior, G-AECU, was a ten-seater powered with four Pobjoy Niagara III engines. In its seaplane configuration, it represented the half-scale configuration of the Empire flying-boat. After flying for the Iraq Petroleum Transport Co, this aircraft was impressed into service by the RAF in 1942 as HK868. It never returned from a flight on 22 September 1943.