It is with great sadness that The National Museum of Computing (TNMOC) announces the passing of the highly respected Professor Simon Lavington. Professor Lavington, an Emeritus Professor at the University of Essex, made immense contributions to British computer science. He was a key figure in the design teams for both the Atlas supercomputer and the MU5 high-performance computer. Following his retirement, he became an invaluable historian of the field, authoring essential books on early British