I am a sucker for a funny name, so Studio London U-DEW-U Highlighter Drops (£5), had me at hello. I expected the texture to be very liquid and watery, but in reality it's more of a blob than a drop – which is no bad thing, as it gives you more control over the product. These are seriously shiny and give skin an almost holographic sheen. If you're after a full-on glow that's going to really show up in photos, then go all in and pat onto the tops of your brow bones, cheekbones, the tip of your nose, and your cupid's bow. I prefer something more pared back, so instead mixed a tiny amount into my foundation for a little added luminosity. It's a good trick if you are watching your pennies, as diluting a more expensive foundation with a cheaper liquid highlighter or primer will help it last for longer.