544 Squadron Operations Record Book at UK National Archives, AIR 27/2028/34
Mosquito Mk IX LR425
S/Ldr D Douglas Hamilton
P/O PE Gatehouse DFM
Ops PR J.314 (multiple objectives listed)
Form 541 Feb 1944 Frame 2
Mosquito IX LR425 served only with 544 Sqn.
Engine vibrated and control lost, abandoned ... SW of Trindom Grange Colliery Co Durham 23 Jul 1944
Halley RAF Aircraft LA100-LZ999 AB 1991
Form 78 Movements: Frame 59 of
Then a Flight Sgt of 248 Sqn, Philip Edwin Gatehouse 902375 had been awarded the DFM 4 Sep 1942.
Neither man was to survive the war.
S/Ldr Lord David Douglas Hamilton, with Gatehouse as Navigator, crashed on return from a PR sortie on 2 Aug 1944 in their Mosquito IX MM240 of 544 Squadron: both were killed instantly.
The crash, near Wallingford, occurred a few miles from the airfield, apparently with both engines dead, assessed to be an attempted forced-landing.
Full details of the crash are in the 544 Squadron Form 540 Summary of events, and noting the loss of the two men by first name and in glowing terms.