Will the hon. and learned Gentleman bear in mind that, in the past few years, Government instructions about what we should do in the event of nuclear attack have varied? We were told that we must all stay in our homes; then that we must evacuate. We are now told, I believe, that some of us must stay at home and others must evacuate. Will he assure us that this new edition of "Protect and Survive" will be his last word on the matter? Otherwise, there is a danger that it will not be taken seriously.