"No mistake about it, this is a very big day for our country: the first time we've built a new nuclear power station for a very long time," the Prime Minister told television cameras today.
He said the deal would be "kickstarting again this industry, providing thousands of jobs and providing long-term, safe and secure supplies of electricity far into the future."
More top news
Kate will join Prince William on a tour of the Stephen Lawrence Centre before visiting a charity working with disadvantaged young people.
There is an "urgent need" for a "simpler and more trusted" system for investigating clinical failures, according to a damning report.
Over 100 mothers and fathers were investigated for leaving their children unsupervised in the final three months of 2014, new figures find.