2 pre-production Wessex HAS.1, re-equipped wih 1450hp Napier Gazelle 13 turbine engines built in 1958. 3 HAS.3 prototypes as the start of the conversion programme from the HAS.1 from 1963. 1 re-engined HAS.1 as the basis of the RAF new build HC.2 programme from 1961. 2 HU.5, one a hybrid and one a true HU.5 prototype for the new build HU.5 programme from 1963.