Superdrug colour performance- seriously! It’s made by P&G who also make Wella professional and according to a hair dresser friend of mine is the closest she’s found to professional colour. It also gets bonus points for being guaranteed cruelty free.
Olia I’ve always found crap for covering greys, I only have a few but it didn’t get a single one. A bit like a complicated hair treatment (it did leave my hair shiny).