Callistemon, the fact that "There was no-one else around - my friend, her two dogs and two police officers" would have been because everyone else other than your friend was following the rules and respecting the risk that comes with going out. The police officers probably warned her that she could have been fined, rather than "threatened".
Maybe if, like me, you have to spend eleven hours a day wearing a mask, visor, plastic apron and gloves looking after C-19 victims, you and your friend might be a bit more considerate and, indeed, respectful of the virus.
EllanVannin, what a horrid thing to say about "foreign nationals". If ever you're in hospital, I really hope that no "foreign national" attends to you or cleans around your bed, while you wait for a "local national" to help you.