Malcolm,
Firstly, I've just done a quick search of KPM's and other gallantry awards awarded to members of police forces between 1909 and 1978 and no one (according to my reference book) from Canterbury Police was ever awarded a KPM. The KPM being introduced in 1909. Are you sure that those shown in the photo are from Canterbury Police?
Secondly, the criteria for the award of force merit badges depended upon the force itself and what the Watch Committee considered worthy. It could be good police work over a long period or a single act, be it policing or creditable conduct of some kind.
Dave.
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