During 1983-84 40028: https://www.englishelectric.org.uk/p178432731/h5482630c#h5482630c 40044: https://www.englishelectric.org.uk/p178432731/h5482630c#h97955a30 40060: https://www.englishelectric.org.uk/p178432731/h5482630c#h6f46f21