Should the UK join the European Union again, and if so, how?
Britain's medium-power status requires institutional anchoring to exercise influence in a world of continental-scale competitors, but the council establishes that rejoining depends on resolving a fundamental question about British strategic identity that Brexit has sharpened rather than settled.
Thatcher argues that sovereignty once surrendered to supranational institutions requires principled independence, advocating comprehensive bilateral trade agreements over institutional membership. Schmidt counters that Britain's geopolitical vulnerability demands European anchoring, where pooled sovereignty strengthens rather than surrenders national capacity. De Gaulle maintains that Britain's Atlantic orientation makes stable European membership structurally impossible, preferring privileged partnership over institutional fiction. Adenauer contends that rejoining requires Britain to demonstrate that European integration enables rather than constrains effective sovereignty, following the path Germany took after its own strategic failure.
The irreducible split turns on whether British strategic culture can accommodate permanent European commitment, or whether any future membership would remain conditional and reversible when Atlantic alternatives prove more attractive.
Confidence summary: High agreement on Britain's need for institutional anchoring, fundamental split on whether British strategic culture permits stable European membership.
1. The core argument
Britain faces a choice that Brexit has clarified but not resolved: whether pooling sovereignty in European institutions strengthens national capacity or surrenders it to continental rivals. The council identifies this as a question of strategic identity, not economic calculation.
Three arguments structure the debate. First, that Britain's medium-power status requires institutional leverage against continental-scale competitors — China, a Pacific-focused America, an hostile Russia. Second, that European institutions demand permanent commitment to European autonomy, incompatible with Britain's reflexive Atlantic orientation. Third, that Brexit created the conditions for genuine choice by forcing Britain to confront what it lost through isolation.
The economic costs of rejoining — accepting rules Britain did not write, surrendering monetary policy, absorbing regulatory alignment — are measurable and manageable. The strategic question is whether Britain has learned that formal sovereignty without institutional influence equals expensive irrelevance. Every member accepts that Britain cannot shape global rules of trade, technology, or security alone. They divide on whether Britain can accept the institutional constraints that make influence possible.
2. How each member frames it
Margaret Thatcher sees this as vindication of principled withdrawal from institutions designed to transfer power from Westminster to Brussels. Brexit delivered the clean break she could not achieve, enabling comprehensive bilateral relationships without supranational surrender.
Helmut Schmidt reframes sovereignty as power pooled rather than power lost. Germany gained influence by accepting Bundesbank constraints within European monetary systems. Britain's mistake was joining late, after institutional design was complete.
Charles de Gaulle views this as structural incompatibility between Atlantic and European orientations. Britain enters European arrangements for tactical advantage, exits when American alignment proves more beneficial. Europe requires permanent commitment to continental autonomy.
Konrad Adenauer frames rejoining as recovery from strategic failure through institutional commitment. West Germany regained sovereignty by accepting constraints that restored capacity for effective action within alliance structures.
3. Where the council agrees
The most surprising convergence: Brexit has strengthened rather than weakened the case for European institutional anchoring by demonstrating the costs of isolation. All members accept that Britain's medium-power status cannot generate sufficient leverage against continental competitors alone. They agree that American strategic attention is shifting Pacific-ward, making European relationships more vital to British security and prosperity.
The council recognises that rejoining now means accepting diminished influence compared to original membership — Britain would enter institutions shaped by others, with reduced voting weight and no opt-outs. They concur that economic adjustment costs are manageable through transitional arrangements. Most significantly, they agree that this choice will determine whether Britain remains globally relevant or accepts managed decline as a middle power without institutional anchors.
4. What would change this verdict
Clear evidence that American strategic commitment to European security remains unconditional would strengthen arguments for Atlantic orientation over European integration. Alternatively, successful development of post-Brexit global partnerships — particularly with India, Japan, or emerging powers — that provide institutional leverage comparable to EU membership would vindicate the sovereignty-first position. Finally, fundamental reform of EU governance structures to accommodate multiple models of membership could resolve the tension between British strategic culture and European institutional requirements.