The product it is recommended you spend most on is the product created to look as if it's not there at all. Foundation promises to even out skin tone, hide fine lines and blemishes, provide a base for colours, fun and doodles, and make you look young again. You can buy it from supermarkets and service stations, but if you buy it from beauty counters they'll make sure you don't buy two shades too dark, which, contrary to mainstream opinion, won't make white skin look tanned, just a bit grubby, as if you've slept on a bench, by a car park. One luxury base is Crème de la Mer's Treatment Powder Foundation (£65, 0870 034 2661). Light enough to layer over the course of the day, it feels as if you're not wearing any foundation at all. Which, of course, is the dream.