I've been out and about a LOT during lockdown. My reasons are legitimate (doing deliveries is the bulk of it) but that wouldn't be immediately obvious to a bystander when I'm driving around in an unbranded hatchback.
I've not been asked why I'm out of the house by a police officer even once since lockdown began, which surprises me. I live in a very urban area, and have seen plenty of them. I don't know anyone who has been stopped and asked. I'm curious to see if this is widespread.
YABU = I've been stopped by the police since lockdown began
YANBU = I haven't been stopped by the police