These plans, donated by Pleasance, Hookham and Nix, Building Surveyors and Architects, of Northampton Street, Cambridge, are thought to be the set from which the engineers worked on the main buildings in the 1960s. Most are the work of Chamberlin, Powell and Bon, the architects, with some modified by G H Buckle and Partners, Consulting Engineers, and some are drawn up by G H Buckle and Partners from scratch. Most are [1960s?] copies of the originals: some are much more recent [1990s?] photocopies. For Dame Rosemary Murray's set of plans relating to the main buildings (incomplete and not all 'as built'), see NHAR 4/4/20.