With a beauty hall (both physical and virtual) stocking hundreds of brands, spanning affordable names to high-end luxury, John Lewis is one of the foremost authorities in the world of beauty on the high street. And its bestsellers for 2020 tell a fascinating story of how we faced one of the most turbulent years in recent memory, from the hair repair formula that sold by the bathtub to the gadgets we invested in as salons and spas closed their shutters.