Let’s start with under eye, which is certainly my biggest beauty bugbear. "Lots of people seem to think that you need to buy a lighter shade to help 'brighten', but in reality that will only make any darkness look ashier," explained Keeley. "Providing you have the right shade, the other reason your concealer might look grey is because you need to use a corrector first. Think about it this way: If you had a purple wall in your bedroom you wanted to paint white, you wouldn’t just go straight in with the white. The darkness of the purple would show through, so you’d use a primer first to knock the colour out. It’s the same principle here – if you have a lot of darkness under the eye, use a corrector to take the worst of it out first." I love Bobbi Brown Intensive Skin Serum Corrector – it’s super hydrating but very lightweight – or try BECCA Under Eye Brightening Corrector for even more coverage.