Major British insurers plan to invest £25 billion into infrastructure projects over the next five years, the government said.
Boosting private-sector infrastructure investment is a priority for the government.
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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.