Hi,
In IWM collections of photos I found Whitley with modified rear - the turret was replaced by opening for parachute jumping.
http://www.iwm.org.uk/collections/item/object/205197364
Was it a typical conversion for all parachute trainers? In photos of jumping from Whitley, for example here
https://upload.wikimedia.org/wikipedia/commons/0/00/Parachute_troops_jump_from_a_Whitley_bomber_during_a_demonstration_for_the_King_near_Windsor%2C_25_May_1941._H9955.jpg
man jumped from the normal doors in middle of fuselage.
In this colection there is another nice photo of similar, early radial Whitley with Y letter on nose
http://zoom.iwm.org.uk/view/40329&cat=photographs&oid=object-205197363described that it was taken in 1941 in Ringway, Manchester.
However - what could be a serial of this machine?
On anather photo serial look to be k72?? - very interesting is partial overpainting by a fin flash
http://www.iwm.org.uk/collections/item/object/205197423
Is there any available complete profile/photo with serial, code letter and perhaps deteils on turret romoved or not...?
Best regards
Jerzy-Wojtek