United Kingdom

While on approach to RAF Gibraltar, the aircraft crashed into the sea off Punta Carnero, south of Algeciras. All ten crew members were rescued while the aircraft sank and was lost.

Shortly after take off from RAF Smith's Lawn, the twin engine aircraft encountered serious difficulties to gain height. It eventually hit trees located at the end of the terrain and crashed in a wooded area. The aircraft was destroyed while all four occupants were slightly injured.
Crew:
F/L John W. Smith.
Passengers:
Cpt Edward Cummings,
Lt Irving T. Golden,
Lt Joseph Luria.

The crew was performing a training exercise and was flying in the vicinity of RAF Moreton-in-Marsh when he was forced to attempt an emergency landing for unknown reason. Aircraft crash landed in a field and was written off while both occupants, an instructor and a pupil pilot were uninjured.
Crew:
Sgt J. G. Berry,
Sgt D. Hall.

The crew left RAF Riccall on the evening of November 23 for a night training exercise with five other similar aircraft. Shortly after midnight, crew informed ground about severe icing and elected to return when the aircraft went out of control and crashed on a mountain slope locate near Colsterdale. All eight crew members were killed.
Crew (1658th HCU):
Sgt R. E. Bacon, pilot,
F/O H. McCarthy, navigator,
Sgt J. Titterton, flight engineer,
Sgt G. H. Manley, flight engineer,
Sgt B. F. Taylor, wireless operator,
Sgt J. J. MacGilliveray, bomb aimer,
Sgt A. Winton , air gunner,
Sgt D. E. Philips, air gunner.
Source: http://laituk.org/Halifax JB926.htm

En route, the crew encountered low visibility due to misty weather. The aircraft was too low and his the slope of a hill before coming to rest. A crew member (A. F. R. Rooks) was killed while 18 other occupants were slightly injured.

Shortly after takeoff from RAF Waddington, while in initial climb, the aircraft stalled and crashed onto a building located near the runway end. While the aircraft was destroyed, all seven crew members were injured.
Crew (467th Squadron):
Sgt C. C. Schomberg,
Sgt H. Steele,
F/Sgt L. R. Seton,
Sgt C. Gifford,
F/Sgt B. W. Fitzgerald,
Sgt H. A. Brown,
P/O L. J. Calderwood.

The crew left RAF Invergordon to perform a night training mission consisting of landing practice. Apparently, an engine caught fire in flight and the seaplane crashed into the Cromarty Firth off the village of Nigg. All four crew members were killed.
Crew (4th OTU):
George Robert Sawhill Riddell,
John Raymond Harnwell,
William McCarroll,
Sydney Albert Spencer.

During a training flight from RAF Penrhos, the twin engine aircraft hit the slope of Mt Craig Cwm shrouded in cloud and located southeast of Penygroes. All five crew members were killed.
Crew (9th AFU):
Sgt Jozef Szczerbaty, pilot,
F/Sgt James Davies, air gunner,
AC2 Ronald Ross, air gunner,
AC2 Philip Andrew Shields, air gunner,
AC2 Herbert Henry Sutton, air gunner.

The crew left RAF Thornaby at 1640LT to perform an ASR mission off the Dutch coast. As no crew was assisted or evacuated on the North Sea, the crew decided to return to RAF Thornaby and while approaching the British coast, he encountered poor weather conditions with thunderstorm activity. While a second Warwick was able to continue its route, BV336 was maybe struck by lightning or suffered turbulence, went out of control and dove into the ground before crashing in a field. All six crew members were killed.
Crew (280th Squadron):
S/L Edgar Andrew Good, pilot,
F/O Willis Wylie Coons, navigator,
F/O Dennis Maurice Stewart, wireless operator and air gunner,
F/Sgt William Vernon Crockett, wireless operator and air gunner,
F/Sgt Douglas Allan Payton, wireless operator and air gunner,
W/O Henry George Richardson, air gunner.

On landing on Lough Erne off Enniskillen, a bow split opened, causing the seaplane to sink. All five crew members were killed.
Crew (423rd Squadron):
W/O William D. Scott,
W/O Charles McDowell Hardcastle,
F/O Rowland W. Hill,
F/O Walter G. Arnold,
P/O Gordon I. Raymond.