Jeremy Corbyn should say that, if elected, Labour will pull the plug on new nuclear.
This would make EDF and the Chinese government think again about the deal Osborne is offering is offering. They would pull out.
Nuclear makes no sense as a solution to climate change. We need an international solution to the climate crisis, and there is no question whether nuclear could provide all of the worlds electricity, let alone all of the worlds energy. It cannot get anywhere near either. There is not enough Uranium 235. And, anyway, politically, the West does not want to see nuclear being developed where it is not in control. Iran shows us this.
Investing in nuclear means that cheaper, more reliable and safer alternative technologies - like onshore and offshore wind and solar heat and pv along with efficiency measures like building insulation, are deprived of that investment.