TV legend Vernon Kay, Coronation Street icon Beverley Callard and EastEnders’ Jessica Plummer to be precise.
However, those watching at home questioned how warm it really was inside the castle should the celebrities feel the need to wear minimum clothing.
To add to this, the UK is currently experiencing a cold snap, as well as the trial being filmed in the dead of the night.
Taking to Twitter to comment, one said: “I am convinced that this castle has central heating. They are walking around in short-sleeve T-shirt’s half the time.”