Watching brief by S Wilson of COT during geotechnical test pitting associated with the proposed redevelopment of Princess Royal Barracks. No archaeological features were identified within the test pits although they did reveal information about the character of the made-ground across the site, particularly in the south in the area once occupied by the military railway. A number of structures and features of potential significance for their military heritage value were identified in areas adjacent to the test pits, including a concrete structure and a possible section of First World War training trench. Building recording was also completed by COT of the sergeants’ mess, the headquarters and officers’ mess prior to their conversion into residential accommodation. All three buildings had been built in the 1930s and were found to be generally unchanged in the public areas.