Way back in the late 1990s, I spent a lot of time in court. What happened, see, was that in the wee small hours of a drunken Edinburgh morning, my friend Jonny and I took a shortcut home through the disused railway tunnel that runs under Holyrood Park. I’d been through it many times, being enraptured with the magic of abandoned urban spaces and, perhaps more to the point, stupid, but never before had it contained a gang of pissed-up youths on a rampage.