Simon Glancey has submitted the following:
Pilot Officer Down was killed when Vickers Wellington II Z8499 of 12 Squadron was lost on a mission to Dusseldorf. The Wellington crashed at Heuthe with the loss of all five 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 X, page 169
He is remembered at Barnard Castle on B135.13, B135.14, B135.19 and B135.22 (where his name is given as Eric Down).