A disaster has befallen Cycling Week. It turns out that my numb, burning leg last week was likely the result of a slipped disc in my lower back – which, by the way, is one of the most old-fashioned injuries a person can have. It belongs to the same category as gout, ricketts, shingles, and – worst of all – ‘a fall’. Also, the idea of discs in the back is a lot to get your head around. No one should have to think about discs all lined up in there like doughnuts in a vending machine, let alone think about one of them being jostled out of position.