The VG 30–38 mass spectrometer was purchased as the main analytical instrument for the new tritium facility at AWE Aldermaston. Numerous tests were performed on the instrument to determine its ultimate performance. The instrument was initially housed in a non active laboratory in the current facility. After several months of testing the instrument was transferred to the new facility. The new facility is currently undergoing its non active commissioning phase. On installation, a programme of work was performed on the instrument to show that it's performance still met both the manufactures and AWE's specification. After completion of this work the instrument was shut down awaking handover of the facility from the building contractor to AWE. The instrument will be switched on towards the middle of 1995 for the commencement of the active commissioning.