Simon Glancey has submitted the following:
Sgt Halbert was killed when Handley Page Hampden I P1233 of 25 Operational Training Unit was lost on a training flight. It had taken off from R.A.F. Finningley on a night time navigation flight, but was lost without trace along with the four crew members.
Royal Air Force Bomber Command Losses of the Second World War: Vol. 7; Operational Training Units 1940-1947; W.R. Chorley; 2002; Midland Publishing; ISBN 1 85780 132 6, page 52
