Wiki has
Quote:
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........ In 1937 the squadron moved to RAF Marham and in December 1938 received the first of the new Vickers Wellington bombers. It was declared operational on the outbreak of war as a bomber squadron under No. 3 Group. 38 Squadron was one of the few RAF squadrons to use the Wellington from the beginning to the end of the Second World War........
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which fits with the NH Code being pre War and the taking of photos before any wartime restrictions. Being an early delivery gives Jan to Sept 1939 as the window for the photo to have been taken.
From Post #4 from Martin, it's unlikely to be L4325 as he has that airframe as first being taken on charge by 115 Squadron after delivery in May 1939.
What you need is an L4xx5 being TOC by 38 Squadron, presumably later than May 1939 if '25 was delivered then.
Not much help, though!
EDIT: Mr Giles has beaten my fumbling conclusion!