There are lots of ideas. Magazines stuffed full of gadgets you think you need: foot spas, page-turners, electric back scratchers, hoverboard shopping carts, and juicers. These are all tumbling out of cupboards across the UK. There are Big Ideas too: hot tubs (now full of green slime), conservatories (which tarnish, leak, and allow cold drafts into the house), and private schooling (only to find your next door neighbour’s kids did better at the local comprehensive). The world is littered with good ideas that weren’t. Medicine is just the same — just as faddish. New diagnoses such as pre-diabetes, pre-hypertension, sero-negative (with normal inflammatory indices), rheumatoid arthritis, and chronic pain are now …