The first was the nuclear waste issue, which we still believe has not been cracked. There's just no solution to that.

The second issue is what's known as lock-in. If you pump all that money into that sort of power station, you become dependent on energy systems of that kind. We think the energy systems of the future will be much more decentralised.

The third issue is around proliferation. I don't believe you can draw a line between nuclear reactors for civil reasons and for use for weapons of war. If you tell people it's OK to have nuclear reactors, on what basis can you tell countries like Iran not to have them?

The last reason is around the security issues and supplies. Is the uranium there in enough quantities, and how vulnerable is it to terrorist attack? In today's world, we are all very nervous about them being a very, very strong target.