The Physical and Theoretical Chemistry Laboratory is one of three laboratories comprising the Department of Chemistry, University of Oxford. As part of the 50th Anniversary of the PTCL in 1991 a book was produced detailing the history of the laboratory. The contents of these pages is based on that book. In the first section are some facts, figures and so on from published reports and members of the laboratory collated by Richard Barrow, whilst the second part is a personal account by John Danby. The original text was written in 1991, but was updated by Professor Sir John Rowlinson to include activity over the period 1991-2001.