Platt gained his medical education at the University of Manchester and in 1926 was appointed lecturer in orthopaedic surgery 1926. He was made professor of orthopaedic surgery in 1939, and became emeritus professor in 1951. In 1955, the University gave Platt an honorary doctorate.
The bulk of this file consists of correspondence relating to the role of clinical professors in the University. This includes correspondence with Sir John Stopford, vice-chancellor of the University of Manchester, and Geoffrey Jefferson concerning the appointment of a new professor of surgery (sheets /1-19). Platt and Jefferson sent Stopford a memorandum in April 1936 which suggested this was an opportunity for the improvement of the contribution of professors to the University, such as the appointment of a research fellow in surgery, cooperation with MRI and the specialist expertise of possible candidates. The file also contains two letters relating to orthopaedic chairs at Liverpool and Manchester Universities, March 1962 (/20-21), correspondence with William Mansfield Cooper, Vice Chancellor of the University of Manchester, and John Charnley relating to Wrightington Hospital and the chair of surgery at the University, 1968-1969 (/22-28) and correspondence with Mansfield Cooper regarding Professor Dunphy and the responsibilities and remuneration of the chair of surgery, 1969 (/29-35). There is also a bundle of biographical material relating to Stopford, with obituaries and a typescript of an entry by Platt for the DNB, 1956- (/36-49), and publicity material relating to the centenary celebrations of the Manchester Medical School and the Stopford Medical Research Fund (/50-52).
There is also material relating to the University of Manchester throughout the Platt papers, in particular see letters from George E. Godber and William Mansfield Cooper discussing Platt's documents on University departments of surgery, 1970 (in correspondence file PLA/7/3).