Simon Glancey has submitted the following:
Sgt. Mitcheson was killed when Handley Page Halifax III MZ342 DT-B of 192 Squadron was lost on a bomber support operation near Stettin. On its homeward journey, the Halifax collided at 2,000 feet with Avro Lancaster i PD376 of 625 Squadron. The Lancaster escaped serious damage, but the Halifax crashed into the sea with the loss of all eight crew members.
Royal Air Force Bomber Command Losses of the Second World War: 1945; W.R. Chorley; 1998; Midland Counties Publications; ISBN 0 904597 92 X, page 72
He is remembered in Blyth on B42.23 and at New Delaval on N51.01