Thanks for all the responses.
All shots taken with the 150 mm lens but the last was at a smaller subject distance with a longer bellows, supporting MartyNL’s theory.
I have made some preliminary tests in the dark and revealed three pinhole light leaks of a not insignificant size which I am taping it seems with some success.
The bellows were sadly creased on one occasion when the camera was closed and the leaks seem to emanate from these areas. I have exposed quite a lot of film with no problems until this week.
I will double check the fitting of film holders and lens board and then plan a test including one sheet with a dark cloth over the camera prior to dark slide removal and some with no dark cloth.
I was surprised that having digitised the negatives, I was able to rescue the shots in Lightroom with some judicious use of the brush, linear and radial gradient selection tools, although it took some time
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