With respect, pursuant to our international treaty obligations, we bound ourselves at the level of international law to allow the EU to exercise competence in areas where previously the UK Parliament would have exercised it. That was then implemented in domestic law by virtue of the 1972 Act. Of course a sovereign Parliament is always able to repeal the 1972 Act, as it is now doing, but so long as it remained in place, and so long as we remained party to the relevant treaty—which became treaties—we were bound in that context. I do not entirely agree with the analysis, but I do not believe it is material for the present purposes, if I may respectfully say so.
Once Brussels had certain competences, it then exercised them. It was important that Brussels should exercise them in one area in particular, which was the development of the EU single market, as no one else could have exercised jurisdiction over a single market in the EU. The idea that 12—now 28—individual jurisdictions could have maintained the single market is self-evidently untenable, so Brussels exercised that jurisdiction, for very good reason. When we leave the EU, we will find ourselves in the position where we want to maintain an internal single market in the United Kingdom; the noble Lord, Lord Foulkes, referred to that, while the noble and learned Lord, Lord Hope, said we are looking forward to the internal market in the United Kingdom. We have to bear that in mind. What Parliament is in a position to legislate for a UK single market? The answer to that is the Parliament that has jurisdiction for the whole United Kingdom. I will come on to the issue of devolved competence in a moment, but generally speaking if you are going to maintain a single market you need a legislative power that is able to do that for the single market.
Lest anyone interrupt just yet, I add that of course by their very nature the devolved Administrations, parliaments and assemblies have responsibility for devolved powers in their respective nations. We respect that, of course, but there is an issue here that has not yet been mentioned. We identified, on the basis of analysis that was carried out with the devolved Administrations, that there were some 153 areas of competence where—