Delivered to Westland as G-ATYU then to the Ministry of Defence as XV370 in 1966. Converted to the prototype Sea King by Westland and used as a development aircraft. To the ETPS at Boscombe Down by 1982 then to Lee-on-Solent for use as ground trainer 8771M. Moved to Gosport in 1996. Still there in 2023.

Ex G-ATYU. Withdrawn from use on 14 December 1989 and used for ground instruction at Lee-on Solent from 8 January 1990 as A2771 (later as A2682). To AESS (later DCAE) Gosport, Hampshire 1996 for ground instruction, where it is still in use in 2022.

The spectacular arrival of the Empire Test Pilots School.

Prior to Westland production of Sea Kings for the British forces, four US-built examples were received as trials and pattern aircraft.

G.I. AT HMS Sultan Royal Naval Air Engineering and Survival School (RNAESS)

Development aircraft