A steward took his bag, introduced him to Atiya Bishara, who would be taking care of Lady Rose during the flight, then gave him a full tour of the aircraft so that he could check for himself that everything was in order.

He was treated no differently from any anonymous security officer who’d been asked to escort Lady Rose on a flight that, historically, should have been his grandfather’s to command. Which said pretty much everything he needed to know about how the rest of the week was likely to pan out.

His aunt might pay a courtesy visit to Lady Rose, but even if she acknowledged his presence it would be as a servant.

Lydia rapidly exchanged clothes with Rose in the private room that had been set aside for her as guest of honour at the Pink Ribbon Lunch.

Lady Rose had walked into the room; ten minutes later Lydia, heart pounding, mouth dry, had walked out in her place.

She held her breath as a dark-suited security man fell in behind her.

Would he really be fooled? Rose had assured her that he would be looking everywhere but at her, but even wearing Rose’s crushed raspberry silk suit, a saucy matching hat with a wispy veil and the late Duchess of Oldfield’s famous pearl choker, it seemed impossible that he wouldn’t notice the difference.

But there was no challenge.

Smile, she reminded herself as she approached the hotel manager who was waiting to escort her to the door. It was just another job. And, holding that thought, she offered the man her hand, thanked him for doing such a good job for the Pink Ribbon Club, before stepping outside into the thin winter sunshine.

Rose had warned her what to expect but, since rumours of a wedding had started to circulate, media interest had spiralled out of control. Nothing could have prepared her for the noise, the flashes from dozens of cameras. And it wasn’t just the paparazzi lined up on the footpath. There were dozens of ordinary people hoping for a glance of the ‘people’s angel’, all of them taking pictures, video, with their cellphones. People who thought she was the real thing, deserved the real thing, and she had to remind herself not just to smile, but to breathe.