Well, as his question implies, we were the first Government to draw attention, over two years ago, to the constitutional challenges presented by Brexit, which he highlights in his question. And the 20 propositions in reforming our union describes the UK as a voluntary association of nations. Wales remains committed to that association, but it must be based on the recognition of popular sovereignty in each part of the UK, and not the outmoded version of parliamentary sovereignty, which we often have cited. I hope very much that the constitution, democracy and rights commission, which the UK Government has committed to establish within the next 12 months, will consider those proposals, rather than focusing on narrower interests. The UK, as his question implies, was constructed really not through any conscious plan, but as a result of pragmatic and politically expedient decisions. But the devolved institutions of Wales, and other parts of the UK, were established on the basis of popular endorsement, through referenda, which bring with them their own source of legitimacy, and that will be essential for the UK Government to recognise in any future discussions and negotiations over the future of the union.