But this is not a documentary, and Welsh is too much of an entertainer to labour the point. The strength of Skagboys lies in its characters, and Welsh’s poetic rendering of their innermost thoughts. The streams of consciousness are polluted by chemicals, and it takes a little care to distinguish between the ramblings of Renton (self-critical, with literary leanings) and Spud (comically optimistic, and prone to convoluted rhyming slang). “Lou Reed”, meaning “speed”, is guessable. Less obvious is “Lou Macari” meaning “barry” or “very good” in Leith-ese. (Younger readers may wish to note that Macari was a Scottish international footballer. Ian McLagan, meaning “shaggin”, was a musician). The voice of Welsh’s most compelling character, the “pavement warrior” Franco Begbie, will need no signposting.