u/Sensitive-Spare-5758

So I've lived in Barnet my whole life and for as long as I can remember I've seen hand scrawled, messy street signs on electricity boxes all around Barnet. They'll say things like "Barnet hospital, 1/2 a mile" with an arrow. I've always found them totally fascinating, and long wondered who might have drawn them. Has anyone else noticed these? / Do you have any idea where they might have come from?