Steve,
Can't help with the letter of the 196 Sqn Wellington but here is a little on the troubled existence of the the pilot, 1313694 Sgt (Pilot) Russel Verian ROSSER RAFVR, whilst with 466 RAAF Sqn.
http://466and462squadrons.com/CrewOps/RosserRV.html
19-20 Feb 1943
466 Sqn
Wellington X HE531 HD-
Op: Wilhelmshaven
T/o 1820 Leconfield. Crash-landed, on return, at Kirmington airfield, Lincolnshire, after being badly shot about by a Me 110. In the confusion, Sgt Crowhurst baled out and he is commemorated on the Runnymede Memorial. Sgt Wilcock claimed their assailant destroyed by his return fire.
Sgt R V Rosser
Sgt D Livingstone - Inj.
Sgt E F Crowhurst +
Sgt F J Brown - Inj.
Sgt H Wilcock
See: BCL4/47
and...
https://www.rafcommands.com/database...php?uniq=T5819
Col.