We know how serious the British are about their tea, so it's no surprise that there's a correct and proper way for the British royals to go about it. Drinking tea from small bone china cups can be a delicate affair, and so hand and mouth position is critical to avoid looking like a fool in the process.
According to etiquette expert Myka Meier, a Royal should pinch the handle of the cup between their thumb and index finger, support the base of the cup with their middle finger, and ensure that they always have the handle facing precisely three o'clock. Not only is this the most comfortable way to handle a hot cup, it also ensures that you're sipping from the same part of the rim at all times, which avoids the embarrassment of getting lipstick all around it. That's obviously a bigger concern for the women than the men.