Prince William is said to have become more short-tempered and demanding in private as he readies himself to take the crown – with insiders telling RadarOnline.com he intends to deal firmly with Prince Harry and Prince Andrew once he becomes king.

The 43-year-old Prince of Wales, long seen as the steady and approachable face of the monarchy, has reportedly grown less patient and more formal as he shoulders the responsibilities of his father King Charles , 76, who continues treatment for cancer . Article continues below advertisement

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William is already taking on a heavier workload and, according to sources, has been heard insisting staff address him only as "Sir" rather than by his first name.

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