China's state visit to Britain moves from warm toasts and ceremony to cold, hard cash Wednesday, with business deals including a major Chinese investment in the U.K.'s first nuclear power station since the 1980s.

President Xi Jinping is expected to sign an agreement that will lead to his country financing 30 percent of the cost of the Hinckley Point plant in southwest England. It is set to be completed by 2025 and will be built by Electricite de France and a group led by China's state-owned nuclear company. EDF sought investors after it was unable to cover the cost of the deal alone.

The British government has agreed to underwrite 2 billion pounds ($3.1 billion) in Chinese financing to secure the deal and pave the way for majority Chinese ownership of a second nuclear plant planned for England's southeast.

The deal has faced criticism from those who suggest Conservative Prime Minister David Cameron has been wooing the Chinese for trade deals while ignoring the country's human rights record.

Xi has been welcomed with lavish ceremony on his visit, which began Tuesday with a day of pomp that culminated in a banquet at Buckingham Palace during which Kate, the Duchess of Cambridge, toasted the Chinese leader.

On Wednesday he is due to hold talks with Cameron at 10 Downing St.

Steve Hilton, a former close adviser to Cameron, called the visit "one of the worst national humiliations we've seen."

"I think that we have to be much tougher," he told the BBC. "I think that we should consider sanctions on China, not rolling out the red carpet."

The nuclear investment is the highest-profile of some 30 million pounds ($46 million) in business deals that Britain hopes will be signed during Xi's four-day stay.

Others include a 325 million-pound ($502 million) package of partnerships in the creative and technology, including a 50 million-pound ($77 million) deal between Aston Martin and China Equity to develop its zero-emission RapidE sports car.

Britain also plans to slash the price of visas for Chinese tourists in hopes of attracting more visitors.