Simon Glancey has submitted the following:
Flight Sgt. Richardson was a Wireless Operator/Air Gunner aboard Avro Lancaster II LL733 JI-S, of 514 Squadron, which was lost without trace on a daylight bombing mission to Caen, with the loss of all seven crew.
Royal Air Force Bomber Command Losses of the Second World War: 1944; W.R. Chorley; 1997; Midland Counties Publications; ISBN 0 904597 91 1, page 365