Baking royalty Dame Mary Berry shared tips on how to make the winning Platinum Pudding in honour of The One Show's jubilee special on Thursday. Jemma Melvin's lemon Swiss roll and amaretti trifle beat 5,000 desserts to become the official pudding of the Queen's Platinum Jubilee celebrations. Resplendent: Baking royalty Dame Mary Berry, 87, shared tips on how to make …