Just when I thought I had it figured out (illustrations of NE-D showing sky undersides) - I checked the Great Book of WW II Airplanes and PG 348 (Mosquito) shows an illustration of Mk. VI Squadron 143 (NE-A) from Banff with a deck tan underside. Even mentions NE-D and it's mission.
So - not as clear cut as I thought.
By the way, anyone have a Mosquito reference book they'd like to sell?