Glenn Murtha tells the story of this photo in an interview with The Guardian, extracted below for your reading pleasure:
he derelict houses in our neighbourhood were our playground. We’d jump from the second-floor window on to a pile of mattresses. Sometimes we’d get a bit hurt, but we didn’t have any fear in those days. Mrs Thatcher had just come to power and it was a time of austerity. My dad had his own scrap business, so he got a bit of trouble from the council for having vans and scrap in the yard, but he made a living from it, so they left him alone.