Without going into the ins and outs of the Duke and Duchess of Sussex’s withdrawal from royal life, still less the merits of the Duchess’s privacy case against the Mail on Sunday, a claim made by her lawyers this morning cannot be allowed to pass without comment. They claim: ‘This contribution of public funds towards crowd security was far outweighed by the tourism revenue of over £1 billion that was generated from the royal wedding of the Duke and Duchess of Sussex which went directly into the public purse.