Hi there
Interesting.
My (mistaken) assumption was whoever wrote 'Debert Nova Scotia' on the original photo was correct. That the person in the photo either wrote it himself, or instructed someone else directly to do so.
There is a lot of evidence here the photo was taken at Bordon.
Perhaps the caption was written long after the event or by someone who was making a guess as to where it was taken.
We shouldn't be too hard on the writer. Do YOU have correct captions on all your photographs?
Steve