Nowadays such forces are readier to fight protesters with distance weapons (such as rubber bullets) rather than grappling with them at close quarters, as British bobbies do.
But Sir Peter once told me how he had seen bobbies among the T-shirted crowds of a summer community fete looking more like Robocop than Dixon of Dock Green.
First Minister Alex Salmond, whose government has pledged to boost additional police officers by 1, 000, has previously said that, if faced with having to cut costs, he would put "bobbies before boundaries".