Simon Glancey has submitted the following:
P/O Howlett was killed when Vickers Wellington III BJ777 of 12 Squadron was lost on a mine-laying operation off La Pallice. The Wellington crashed into the sea with the loss of all six crew members.
Royal Air Force Bomber Command Losses of the Second World War: 1942; W.R. Chorley; 1994; Midland Counties Publications; ISBN 0 904597 89 , page 206
He is remembered in Blaydon on B111.08, in Durham on D47.052 and in Whickham on W86.01