When it comes to selecting a "Platinum Pudding" to mark the Queen's jubilee celebrations this summer, nothing must be left to chance.

       The decision will be entrusted to a panel of experts including national treasure Dame Mary Berry, Masterchef's Monica Galetti, Mark Flanagan, the monarch's own head chef – and a social media star known to his fans as the "Topless Baker".

       Matt Adlard who has more than one million followers for his baking masterclasses, will represent the social media generation for the jubilee judging panel, which is seeking submissions from all walks of life.

       Organisers hope to encourage home cooks aged eight and over to send in their best recipes for an original pudding, which will become the dish of the Platinum Jubilee street parties.

       Five finalists will cook their creations for the judging panel at a live event at Fortnum & Mason in Piccadilly, central London, in March.

       As the competition was launched on Monday, Mr Flanagan offered his top tips for success, suggesting he would be looking for simple dishes with a "subtle and elegant" finish.

       The Telegraph can disclose that fellow judges will include Liam Charles, a 24-year-old Great British Bake Off star, Jane Dunn, a food writer and blogger, and Regula Ysewijn, a food photographer and historian who has written six books including Pride and Pudding.

       They will join Roger Pizey, the executive head of pastry at Fortnum & Mason, in a panel designed to appeal to all generations.

       Mr Adlard, 30, who has no formal culinary training, shot to fame by "going topless" for a series of YouTube baking tutorials for an audience primarily consisting of 18-34 year olds. He runs online cookery school Bake It Better.

       Despite the special events over the June Bank Holiday weekend, not everyone will be celebrating the Queen, who will then be 96. Republic, an anti-monarchy campaign group, will use the jubilee to publicise its "Not Another 70" project to end the reign of the Royal family.

       Graham Smith, chief executive of Republic, called the monarchy a "shabby institution" which is "set against our nation's deeply held democratic principles".