Building 68 (Watch Office)

The Watch Office, known as Building 68, was constructed in 1927 by the Air Ministry's Directorate of Buildings and Works. It is built of stretcher bond brick and features a gabled slate roof. The building is single storey, with a gabled south front that includes a bay window with steel casements for the duty pilot's office. The east elevation has a soldier arch over a central half-glazed door, which provides access to the duty pilot's room to the south and a rest room to the north. The interior is plain.

This building is a rare surviving example of a pre-1934 watch office, an early type of control tower where pilots would report. Its historical significance is enhanced by its associations with the nearby later 'tower' design (Building 54) to the east. The evolution of radio communication and the need to organize the airfield for take-off, landing, and taxiing led to the development of control towers, transitioning from simple watch offices to more complex designs by 1934, which integrated traffic control and weather monitoring.