Agree with the little chance of the Police getting involved. The stories about people getting pulled over and grilled are whipped up by the media and used to get compliance. I've travelled legitimately throughout all lockdowns for work, food shopping and childcare issues and never seen anymore people getting stopped by the Police than you'd normally expect to see.
I think if in doubt, put a bag of tools in the car and if stopped bambozle the officers with some boat talk about exploding composting toilets, thefts, sinkings, fraying ropes etc and they soon leave you to it.