Reuters: Britain is expected to give the go-ahead to a new generation of nuclear power stations next week, sparking a frenzy of deal-making by nuclear firms as well as a fresh challenge from environmental campaigners. "I don’t think the government has any other option," said analyst David Cunningham at Arbuthnot Securities. "It’s a necessary evil." Nuclear operators say they could have new plants running by 2017, helping Britain to meet its 2020 goals for combating …