We had temporarily lost Prince William. Rushing through the narrow streets of the Old Town of Al Ula in Saudi Arabia, our guides eventually helped us catch up with him. They had changed where he was due to arrive, after his lunch had run over. It was all fairly frantic, but for his aides, now tasked with getting him to his plane on time to head home, this was nothing like the other challenges they had faced. This has felt like a week where the royal family have really seen what they are up