It’s July and the rain – alien, sub-tropical rain, not normal Glasgow rain – is so torrential and persistent it takes over a week after my walk with Ronnie Scott to return to the Necropolis to shoot material for this project. A worn-out film adage – ‘you can’t buy the weather’ – never rang truer than during a Glasgow summer. But I’m not in the market for artificial continuity, so I have to go with what I’m given. Actuality…