My Lords, I am not Cumbrian and I have absolutely no connection with Cumbria—I live in Southwark—but I support the noble Lord, Lord Liddle, in his request that this order be withdrawn. It is clear that he was speaking from a democratic point of view, which is an incredibly valid thing to be concerned about. The fact that it is Labour legislation does not mean that it has to be used; there is a lot of quite bad legislation still on the books that really ought to be repealed.
There are a few environmental concerns expressed in a report called Rock Solid?, which was produced for Greenpeace specifically for this sort of action. There are concerns that have to be answered and the relative risks and dangers, as the noble Lord, Lord Judd, said, have perhaps not been assessed as stringently as they might have been. For example, copper and steel canisters and overpack containing spent nuclear fuel or high-level radioactive waste could corrode more quickly than expected; we do not know. The effects of intense heat generated by radioactive decay and the chemical and physical disturbance due to corrosion, gas generation and biomineralisation could impair the ability of backfill material to trap some radionuclides.
The build-up of gas pressure in the repository, as a result of the corrosion of metals and/or the degradation of organic material, could damage the barriers and force fast routes out through crystalline rock fractures or clay rock pores. There are also poorly understood chemical effects, such as the formation of colloids, which could speed up some of the more radiotoxic elements such as plutonium. Unidentified fractures and faults, or a poor understanding of how water and gas might flow through the ground, could lead to the release of toxic materials into groundwater. These are concerns that cannot be ignored, and the order needs a little more research about whether this is an activity that can be supported with a view to complete public safety. I would argue that it is not, but I look forward to the Minister reassuring us.