By Jennifer Newton & Steven White A brief moment at the end of a royal engagement led to suggestions that Princess Kate prompted Queen Camilla with the subtlest of reminders about their family’s hierarchy The pair were both in their traditional places on a balcony of the Foreign Office, overlooking the Cenotaph in Central London, during last year’s Remembrance Sunday service. Wrapped up in elegant black coats and hats, they watched on as King Charles led the nation with a poignant two minutes’ silence for the second time during the event since becoming monarch. He then laid a wreath followed b…