Fixed it for you
Two points to consider:
1. police forces of the day were less robust and had fewer tactical and operational capablilites; and
2. P Res units were not deployed on Op GINGER and ESSAY as conventional wisdom held that neither the units or individual soldiers were suitable to the task, nor were they required given the number of soldiers in the Regular Force at that time. Contrast that with recent experience (PODIUM, CADENCE etc.)