May we have an assurance that the right hon. Gentleman is not to pay a second visit to Woomera? At the same time, will he inform the House—this is very important—what was the cost of his visit to Woomera and how long he remained there? Will he also inform the House what this device is intended to achieve? Is it to be part of the British independent nuclear deterrent, or what is its purpose? Is it not, in fact, going to prove just a white elephant?