The Ratification Illusion: Giving Westminster a Real Say on Treaties

Treaty scrutiny is the quiet constitutional gap of the post-Brexit settlement. The Constitutional Reform and Governance Act 2010 gave Parliament a statutory role, but it is a role built around a negative procedure: a treaty is laid before both Houses, and if the Commons does not resolve against ratification within 21 sitting days, it may proceed. The Lords can debate and report, but cannot block. Even a Commons resolution is not a veto in law; it obliges ministers to explain why they intend to proceed. In practice, that is a powerful political signal. In constitutional practice, it is a thin reed.

That gap mattered less when trade policy was largely a European competence. It matters a great deal now. The United Kingdom negotiates, signs and ratifies international agreements in its own right, from trade and investment to data, defence, fisheries and regulatory mutual recognition. These are not peripheral instruments. They can bind future governments, alter domestic regulatory space and create rights and obligations that courts must apply. Yet the Commons often sees them only after the negotiating text is closed, with no practical power to amend and precious little time to interrogate.

The 21-day window that is not

The CRAG procedure is often described as a 21-day scrutiny period. That is accurate but misleading. Twenty-one sitting days can pass in a few weeks, and the clock runs while departmental lawyers, select committees and the devolved legislatures are still working out what the text does. The Commons can pass a resolution against ratification, but the government may still proceed after making a statement. The Lords has a parallel role, but no veto. The result is a system that provides information and occasional embarrassment, not consent.

For routine treaties, that may be adequate. For major agreements, it is not. A treaty is not a bill. It cannot be amended line by line without reopening negotiations with foreign partners. But the absence of amendability is precisely why Parliament needs a meaningful moment of approval or refusal before the point of no return. Otherwise scrutiny becomes a post-match analysis of a game already decided.

Why treaties are different

The centre-right case for reform rests on a simple constitutional proposition: the Crown may conduct foreign policy, but it should not be able to commit the country to legally binding international obligations without a clear parliamentary mandate. That is not a denial of executive competence. It is a condition of democratic legitimacy. Parliamentary sovereignty is not a slogan for select committees; it is a principle that applies when power is exercised through treaty as much as through statute.

The objection is familiar. Give Parliament a veto, and foreign partners will see a negotiating process they cannot rely on. Give MPs a mandate, and every trade deal becomes a hostage to domestic politics. Both concerns are real, but they justify a calibrated mechanism, not the current vacuum. The answer is not to import the United States Senate. It is to design a scrutiny reserve that preserves negotiating flexibility while closing the accountability gap.

A scrutiny reserve, not a Senate

A better model would rest on four pillars. First, before formal negotiations on a major treaty, the government should publish its negotiating objectives and an impact assessment covering the economic, regulatory and constitutional implications. The Commons should debate those objectives on a government motion. That motion need not be binding, but it would give ministers a clear sense of the House's priorities before concessions are made.

Second, a standing joint committee on treaties should receive confidential briefings during negotiations. It should be able to summon ministers, question chief negotiators and report before signature. Confidentiality is essential; the committee should not become a parallel negotiating chamber. But it should not be reduced to reading the final text on the department's website.

Third, for major treaties, ratification should require a positive approval motion in the Commons. The government would control the timetable, and the motion would not be amendable except by leave. That preserves executive control of the process while ensuring that the House actually says yes or no. The Lords should retain its scrutiny and reporting role, but not a veto. A positive motion in the elected House is the right constitutional balance.

Fourth, urgency needs a principled exception. If a treaty must be provisionally applied before scrutiny can be completed, the government should be required to make a statement, publish the reasons and provide for a sunset clause of no more than 90 days unless the Commons approves continuation. That prevents emergency procedures from becoming the normal route.

Closing the gap in 2026

None of this requires a written constitution or a constitutional convention. It requires amendment of the CRAG framework and a change of practice. The government should define major treaties by reference to their legal and economic effects, not by ministerial discretion. It should publish a treaty register with clear timelines. It should give the joint committee a statutory basis and a modest secretariat. And it should accept that a Commons refusal is not a constitutional crisis; it is a signal that the executive has not yet made its case.

The Conservative tradition should be comfortable with this. It believes in executive energy, but not in executive unaccountability. It believes in parliamentary sovereignty, but not only when Parliament is doing what the government wants. It believes in trade, but not in treaties that bypass the very institution that gives them democratic authority.

The current 21-day window is a ratification illusion. It lets ministers say that Parliament has scrutinised an agreement when what Parliament has actually done is run a finger down the text before the train leaves. In 2026, with trade policy a central instrument of statecraft, Westminster can do better without tying ministers' hands. A scrutiny reserve would strengthen the executive's mandate, not weaken it. It would make treaties more durable because they would be more legitimately made. That is not a constraint on governing. It is a condition of governing well.