All I can tell you is it's the Bristol production line in around 1960. I took this from the road outside, probably before I was chased away!!
I can't even tell you why the line on the right seems to be at a stage of assembly quite a while before the left hand line. I'm sure we have some knowledgeable members who can explain this.
Photo taken by David Field, late 50s/early 1960, Bristol
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