It's that right? A BBC person two days ago said it seemed reasonable as long as you go to a place with few people, but he was hung, drawn and quartered. Yesterday a BBC correspondent said it wasn't allowed to drive to a walk start point.
I did a bit of googling and all concluded it was ok. There is nothing about non-essential travel just reasons you can be out of your home. If you can't travel to walk, you can't travel to shop by definition. But also, all concluded that the police have the power to interpret 'stay at home' and stop, detain and fine you if they want so they said don't do it!