Search for wellness retreats in the UK and you'll get hundreds of results within about four seconds. Week-long yoga holidays in Devon. Silent weekends in the Lake District. Spa hotels that have added a wellbeing menu and a green juice. They all promise a reset. They do not all deliver the same thing, and some of them deliver very little beyond a nice photograph. This is a guide to working out which one you actually need. What to ask before you hand over money, which red fla
