For many people of a certain age (full disclosure: mine), punk has been a weirdly persistent presence. These days, we may not often be tempted to sit down with a glass of wine and an album by the Cortinas, Chelsea or Eater. We may even have belatedly realised that the most revolutionary record of 1977 — the year punk officially conquered Britain (and, incidentally, the country’s five bestselling singles were by Wings, David Soul, Julie Covington, Leo Sayer and David Soul again) — was Donna Summer’s ‘I Feel Love’.