I reckon it is an Fokker XXII. Scottish Airlines started the war with two of them plus a Fokker XXXVI. The three aircraft were impressed into military service and used as flying classrooms for training Observers.
The aircraft were bought from KLM.
F XXII PH-AJR became G-AFXR and was impressed as HM159. This aircraft caught fire over Loch Tarbert and crashed on 03.07.43. I can remember being told as a lad that a cigarette end was involved.
F XXII PH-AJP became G-AFZP and was impressed as HM160. This aircraft survived the war and was the favourite of Gp Capt McIntyre. When I was a little lad she would fly in the summer months between Prestwick and the IOM.
The noise on take-off was pretty spectacular. (Can you imagine four T-6 Harvards in formation). She was eventually broken up in 1952 (which broke my heart).
F XXXVI PH-AJA became G-AFZR and was impressed as HM161. This aircraft crashed on take-off from Runway 26 at Prestwick on 21.05.40. I believe the wreckage ended up in the Pow Burn just off the end.
I shall now go and take my anorak off!