French Foreign Minister Jean-Marc Ayrault, in London to take part in the formal signing ceremony for the Hinkley Point nuclear power plant project, said it was a good deal for Britain and France despite widespread reservations.

"It's a good deal. I know it has raised questions, particularly in France, but it represents an opportunity for the future of an entire industry," Ayrault told reporters just before heading to the ceremony.

New British Prime Theresa May unexpectedly put the Hinkley Point project on hold in July when it was about to be formally signed, citing the need to review the details. She finally approved it two weeks ago.

"Mrs May had taken office and a new prime minister, a new government was perfectly entitled to examine the contents of the agreement," he said, adding he was pleased May had finally approved a deal which would benefit Britain, France and Franco-Chinese nuclear cooperation.