William and Kate's eldest child is said to be shyer than his younger sister Charlotte, and the Duke has told how his son loves helicopters, flying and is obsessed with all things police-related.

Like Charlotte, George is rarely seen in public. The Duke and Duchess try to ensure their children are protected from media intrusion.

But the pair have appeared at key royal events such as the annual Trooping the Colour parade, and have joined William and Kate on official overseas tours.