Safety, of course, must be paramount at all times, but if the two-thirds of the heat produced by these generators which is at present wasted could be utilised in district heating systems, and since the Magnox reactor is now accepted as safe, does my right hon. Friend agree that it is worth looking at the policy again because the economics of nuclear generation of power would be transformed if these generators could be sited near centres of population, where their waste products could be utilised?