Contains plans coving stage 2 for the construction of the west building as well as the construction of a connecting corridor between the two building and an eventual refurbishment of the east Building including the addition of n north extension to the east Building. The west building was usable by 1969 and the changes to the east building were undertaken after this.

Work began 1966, the 'breakthrough' between buildings finished by summer 1966, north extension to the east building by 1967, the west building 1969 and the east building conversion ending the project in summer 1970. Architects Castle and Park.

All stage 2 plans contain the original plan number in black ink. These have been arranged in keeping with the original order, any missing plans are represented within the structure.