Irvine Welsh’s 1993 debut novel Train-spotting flicked a hearty V-sign in the face of alarm-clock Britain. ‘Ah choose no tae choose life,’ crows its giro-cheating antihero Mark Renton, proudly enslaved to heroin instead of mortgage repayments. But when Welsh revisited his native Leith for a 2012 prequel, Skagboys, he threw over this bourgeois-taunting amorality for blunter politics: Renton, it transpired, first turned to heroin for pain relief after police beat him up on a picket line during the 1984 miners’ strike.