He checked his Hogwarts list yet again to make sure he had everything he needed,
saw that Hedwig was shut safely in her cage and then paced the room,
waiting for the Dursleys to get up. Two hours later, Harry’s huge,
heavy trunk had been loaded into the Dursleys’ car, Aunt Petunia
had talked Dudley into sitting next to Harry and they had set off.
They reached King’s Cross at half past ten.
Сегодня во время занятия встретил такой странный Past Perfect. Это что за нах?
Его здесь не должно быть.
Если он относится к "They reached King’s Cross at half past ten.", то это как штаны через голову надевать.