Guest judges in Series 1 included Maisie Williams, Geri Halliwell, Jade Thirlwall, Andrew Garfield, Michaela Coel, Cheryl, and Twiggy. MNEK and AJ & Curtis Pritchard served as guest vocalists and choreographers to the contestants during themed tasks. Dawn French revealed herself to be the first guest judge of the second series. She went onto reveal that the BBC had originally asked French to be a main judge on the first series. French said: "They did originally ask me if I would be a full-time judge, but I couldn't – because I just don't live in London. But I am going to be a guest judge in a couple of weeks." She further revealed that for the second series, due to COVID-19, that each of the judges would sit on their own panel, instead of sitting together on one panel. As well as a "sort of Perspex between each judge". Series 4 guest judges were revealed on 31 August 2022 to include: Olly Alexander, Boy George, Alison Hammond, Mel B, Dame Joanna Lumley, Lorraine Pascale, Leomie Anderson, FKA Twigs, Hannah Waddingham, and former RuPaul's Drag Race contestant Raven.
