Government proposals have been announced to stop abuse like that uncovered at Winterbourne View ever happening again.
Charity Mencap has welcomed this as a moment of real potential change.
Care minister Norman Lamb says he will look at changing the law so that corporate boards will bear some responsibility in future.
Mr Lamb said he hopes this is a watershed moment for people with learning disabilities in England post Winterbourne View.
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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.