My honest answer is that I do not know if they are more efficient. I assume that they are—why would they not be?
I am of the view that we should not go nuclear if there are low-carbon technologies that can outperform it at scale and within the time frames that we need, because I accept that there are issues with nuclear. For example, we have not solved the waste problem. The question for the House, though, is whether that problem is more severe than global warming. We must make choices. We need to decide whether the waste issue is containable—no pun intended—whereas the global warming issue is not containable. However, it is nonsense to pretend that nuclear is not part of the decarbonisation of the world.