My little deskside pal, the Nailberry Little Treasure Nourishing Cuticle Oil (£15.50) may be mini, but it's a powerful nail treatment. The formula contains sweet almond and castor oils, which helps promote nail growth and repair brittle nails. It's got a small dropper applicator, meaning it's hard to squidge out too much oil; a quarter of a pipette is enough cover all of your nails.