As if all this were not enough, David took on many other obligations. Thus, in his second period in Cambridge he served on the Council of the Senate, as deputy vice-Chancellor, Chairman of the Chemical Engineering Syndicate and also of the Faculty Boards of Engineering and Education. In the wider world, he was chairman of the Advisory Committee on Safety in Nuclear Installations, a member of the Engineering Council and an Hon. Editor of Trans. I. Chem.E. He was on the councils of at least six secondary schools. At Homerton College he chaired the Board of Trustees for 31 years, when the teachers’ training college was becoming a very proper Cambridge college – the second seen by David to gain full Collegiate status in Cambridge. Inevitably. he was a member of various ecclesiastical bodies, such as Ely Cathedral Council and the Royal School of Church Music. He was vice-President, and subsequently President of the I.Chem.E., as well as Director of the Salters’ Institute of Industrial Chemistry and a member of the Board of Management of the Northcott Theatre in Exeter. His honours included CBE, FREng. and honorary degrees from Keele, York and Exeter. Throughout all this he was supported cheerfully and stylishly by Sheila. They worked together extremely well.