My Lords, I start by thanking the noble Lord, Lord Lang, for his historical insight. As a mere contemporary historian, I think more in months than decades. However, I note that in the period I have studied, families have become rather smaller; having two or four children seems to be slightly more normal now. If it is true that the Deputy Prime Minister took six as a purely arbitrary figure, perhaps it is connected to his belief that 600 is an appropriate number for MPs in the House along the way. However, I am sure that that was not the case.
The purpose of the need for consent is to recognise the interests of the Crown, as advised by the Privy Council, and to acknowledge the public interest in the question of the potential consort to our head of state. We do not imagine that any likely heir would seek marriage with the head of state of another country with whom perhaps we have less than friendly relations, but clearly there is a public interest, and an interest to the body politic, as well as to the lovebirds concerned, in such a matter. Therefore, there is reason to consider the matter of such an intended marriage in this way, with the consent of the monarch, because we know that that means that those wider considerations will be brought to bear—I assume with due advice from Ministers. At Second Reading, my noble friend Lord Stevenson asked about the sort of advice that might be proffered in cases where consent might not be given. The Minister might like to suggest some of those scenarios, if thought has been given to them.
There is no indication that any such need for consent—perhaps the case of the late Princess Margaret disproves this—has ever caused a problem. I refer to the need for consent rather than consent being given. Of course, I am sure that if there were such cases in the past, they were kept fairly discreet.
Despite the concerns of the noble Lord, Lord Lang, the figure of six appears fairly sensible. It is one more than has ever been needed, but not so large that those whose chances of succession frankly are tiny need to take the time of the monarch and his or her advisers by requiring their consent. We look forward to any further comments from the Minister.