Prince William's secret code to Kate when he wants to move along during outings

Like most married couples, Prince William and Kate Middleton have a well-rehearsed secret code to help them subtly communicate during public outings. And when the Prince and Princess of Wales viewed artefacts from the Royal Collection at Windsor Castle during a state visit from the German president last week, this covert style was captured in a rather heartwarming moment. As the couple looked on at the several items on display in the Green Drawing Room, Kate was seen holding an animated conversation with one of the curators. But while her husband initially appeared captivated by their conversation, he soon spotted that his uncle, the Duke of Edinburgh, was moving towards their table. In a quick bid to prompt his wife to move on to the next set of items, William placed a delicate hand on Kate's back - a subtle signal that it was time to wrap up their conversation. Kate clearly sensed William's restlessness and they both soon issued a heartfelt 'thank you' before walking away.