The Duke of Cambridge is to become a full-time student studying agricultural management for 10 weeks, Kensington Palace has said.
William will learn about the issues facing the UK's rural communities and the farming industry during the course, based at Cambridge University, which begins next week.
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Accompanied by the Duke of Edinburgh, the Queen will attend the opening ceremony of the fifth session in the Holyrood chamber.
Ms Leadsom has received the backing of Ian Duncan Smith, the former work and pensions secretary.
The former shadow work and pensions secretary is considered a more viable candidate than Angela Eagle, a Labour source has told ITV News.