Possel, on reflection, it was Vol 2 that was hard bound. Vol 1 was loose but they did not re-issue pages but simply cut and paste and that, as I said, was virtually impossible.
It may well have helped give people the benefit of the doubt as no 2 copies would be the same <g>
Also most junior officers in those days were aircraft. Engineers and other FOFL were very thin on the ground compared with 200 odd fofl aircrew on a bomber wing.