When Prince Harry sues Prince William for “wilful and malicious sibling rivalry,” the sensational claims from Spare finally face their day in court. But as the proceedings unfold, it’s not just the brothers on trial - suddenly the very suitability of Wills and Kate as Britain’s future King and Queen is thrown into doubt.

The timing couldn’t be more disastrous. Charles and Camilla are preparing to abdicate for a blissful retirement in Mustique, leaving the throne dangerously exposed just as the monarchy becomes the centre of the most explosive trial of the century.

Inside the courtroom, tempers flare and secrets spill: scandalous costumes, whispered comments about royal offspring, and shadowy plots that threaten to shake the House of Windsor to its foundations. Meanwhile, Andrew Mountbatten-Windsor and other family members - jockeying for influence and relevance - may well bring down the crown before any verdict is reached.

From the creator of Channel 4’s hit comedy The Windsors, Windsor vs Windsor delivers a gleefully outrageous, razor-sharp lampoon of Britain’s most famous family.