Prue Leith made another Bake Off blunder when she accidentally revealed the technical challenge moments too early in the show’s Christmas special.

While announcing the second of three challenges in The Great Christmas Bake Off, she told the four contestants they would have to make 12 mince pies, although that job usually falls to presenters Noel Fielding and Sandi Toksvig.

The judge’s mishap mirrored her snafu moment a few months ago, when she mistakenly tweeted the winner of The Great British Bake Off hours before the final aired.

However, Leith‘s festive gaffe was taken in good humour by the presenters, her fellow judge Paul Hollywood and the bakers, who fell about laughing.

Instead of just giving her advice to contestants Selasi Gbormittah, Val Stones, Paul Jagger and Beca Lyne-Pirkis, Leith said: “Mince pies, they have to be delicious, they have to look fantastic and the trick is to be very gentle.”

Slightly baffled, Toksvig chipped in: “Now, normally Prue doesn’t give away what it is you’re going to be making...”

Leith, laughing, said: “I realised I did that.”

Meet The Great British Bake Off 2017 contestants Show all 12 1 /12 Meet The Great British Bake Off 2017 contestants Meet The Great British Bake Off 2017 contestants Kate, 29, from Merseyside A health and safety inspector from Merseyside, Kate also dabbles in blacksmithing, furniture restoration and yoga. She also loves the outdoors. When she's indoors though, indulging in her love of baking, she is a fan of "old-fashioned" baking techniques. She taught herself to bake when she began to grow her own vegetables two years ago. Meet The Great British Bake Off 2017 contestants Liam, 19, from North London Hackney-born Liam has been baking for four years and is fondly known as the 'Cake Boy' amongst his university friends. He believes that baking is a universal language that can bring people together from all walks of life, and he wants to make it acceptable amongst his peers and the younger generation. Meet The Great British Bake Off 2017 contestants Chris, 50, from Bristol A software developer who loves the science behind baking and developing quirky flavour combinations. He is a cancer survivor and passionate about helping other people whose lives have been affected by cancer. He is married (his wife's name is Catherine), and he loves sailing, travelling (especially visiting bakeries) and writing. Meet The Great British Bake Off 2017 contestants Flo, 71, from Merseyside Flo is retired and the oldest amateur contestant to appear on Bake Off to date. She was one of 11 children and was raised in Huyton, Liverpool. She met her late husband Richard when she was 21 years old and working at a sausage factory. Following Richard's death two years ago, her son Stephen encouraged her to take up baking. She bakes treats for his restaurant when she's not baking for the family - or 'having a boogie' with friends. Meet The Great British Bake Off 2017 contestants Steven, 34, from Hertfordshire Despite having a background in marketing, Steven's heart lies in the kitchen. His mum, Judi, has been his cooking mentor. He cooks and bakes all of his own food and has lost an impressive five stone thanks to his own home-cooking. He likes putting a twist on recipes from his mum's old cookbooks. Meet The Great British Bake Off 2017 contestants Julia, 32, from West Sussex Julia has spent three years honing her baking prowess so she could enter Bake Off. She is originally from Kemerovo, Siberia. She met her husband Matt while on holiday in Turkey as a 17-year-old. Meet The Great British Bake Off 2017 contestants Yan, 46, from North London Hong Kong-born Yan moved to the UK with her family when she was two. She started to bake seriously 10 years ago when she found herself in between 24 hour shifts, working as a molecular biologist for the NHS. Currently working as a laboratory research scientist, Yan now lives in north London with her wife, Marian and cat Kacey. Meet The Great British Bake Off 2017 contestants James, 46, from Essex James describes himself as a bald, baking banker - but his friends say he looks more like a bank robber than a banker. He was taught to bake by his father more than 40 years ago and grows his own fruit and vegetables to incorporate into his recipes. James lives in Essex with his wife Ann, sons Oliver and Ethan and their three chickens: Sparkles, Superman and Jeff. Meet The Great British Bake Off 2017 contestants Sophie, 33, from Surrey A former Officer in the Royal Artillery, Sophie did not discover her talent for baking until she volunteered to make a friend's birthday cake. The psychology graduate, who lives in Surrey with her boyfriend and a cat named Loki, has also developed a passion for patisserie. When she is not baking, Sophie enjoys track cycling, rowing, teaching military boot camps and is also training to be a Meet The Great British Bake Off 2017 contestants Tom, 29, from Edinburgh Architect Tom lives in Edinburgh with his partner David, where he can often be found making fresh shortbread for family and friends. Baking has always been a huge part of family life for Tom and his siblings, who were taught to bake by their mother, a home economics teacher. The family cherishes recipe books passed down by grandparents from both sides of the family. Meet The Great British Bake Off 2017 contestants Peter, 52, from Essex Born in Brixton, IT programme manager Peter had a well-travelled youth. He lived in Nigeria from the age of seven and moved back to the United Kingdom when he was 24. He has a wife, Tito and two children - Temi and Toni. He was bitten by the baking bug eight years ago when he started making his own bread. He reckons one of his specialities is making a melt-in-your-mouth Macaron, which is based on a recipe from French pastry maestro Pierre Hermes. When he's not kneading dough he loves running on the beach, spinning, playing chess and badminton. Meet The Great British Bake Off 2017 contestants Stacey, 42, from Hertfordshire Former school teacher Stacey has fond memories of helping her grandmother make bread and butter pudding when she was a little girl, but it was during university that she really started to bake seriously. Stacey likes to incorporate her Jewish heritage into her baking, with a traditional homemade Challah with every Friday night dinner.

In October, Leith - who replaced former judge Mary Berry on the show when it moved to Channel 4 from BBC One – had accidentally tweeted a congratulatory message for Bake Off winner Sophie Faldo hours before the finale aired.

She later revealed her blunder had happened because she was in Bhutan in a different time zone, and said she was “mortified” by her error.