My Lords, we encourage all countries which hold weapons of mass destruction—whether chemical, biological or nuclear—to abandon them. I make no distinction here. We are of course very concerned by the rumours concerning Iran's possible development of nuclear weapons. But I come back to the point that I made to my noble friend Lord Jenkins of Putney, that one of the crucial issues in this matter is to move towards a treaty on fissile material. It is self-evident that, in order to develop nuclear weapons, countries must be able to get hold of fissile material. The control of that fissile material through a treaty which has been deadlocked is a very important issue for us to take forward in the discussions which we hope to pursue in April.