Dr Julian Lewis: Will the right hon. Lady arrange for the Deputy Prime Minister to come to the House at an appropriate time to explain his conduct when he was standing in for the Prime Minister at Question Time on 8 April? He appeared to have an attack of amnesia and refused to answer a question, because he claimed that it was "not truthful" for me to have stated in that question that he, the Foreign Secretary and the Prime Minister had all been supporters of the campaign for unilateral nuclear disarmament in the 1980s. If the Deputy Prime Minister were to be brought before the House, perhaps he would explain why he has singularly failed to acknowledge, let alone reply to, a letter from me including the exchange in question and asking him to say what was not truthful in the statement that I made in that question?