Interesting to get two such different opinions, first from Ian S
"Diogenes, to cut through and give you a factual answer, as far as I know it. Vincent had just moved between buildings from which to which I can't recall, but the photos were taken some time just before they recommenced work hence how clean and tidy it all was. It was very early after the war the Series 'B' in the photos shows many of the characteristics of a very early machine."
and second from David Bowen
"these pictures were taken Feb March 1948 the same time as the first Black Shadow was shown to the press they could have been taken by the press they only show the great north rd. factory".
I think the reason for the different opinions is the different interpretation of exactly which set of photos is being referred to in the initial query.
The ones I was considering show an oddly clean large open factory and no people.
The 1948 photos David Bowen refers to are quite different, and include human assembly workers.
I am now pretty sure that the photos I refer to record the first move from the old Great North Road No.1 Works to the No.2 Fisher's Green Works - see PEIrving autobiog p 353-355.
The photos may have been taken at a weekend, hence the absence of people, "in Autumn of 1946" .
But the exact purpose of getting professional photos taken of rows of components remains unclear.
"I suspect that this display was to impress some visiting bigwigs such as potential investors, but that is just a guess." remains the most likely reason, in my opinion.
Maybe the club Archivist could tell us more - there have been over 950 views to date, so there has been significant interest expressed in the topic.