The question of Britain's future relationship with the European Union has resurfaced under the Burnham administration, which has kept open the possibility of a closer arrangement — and, eventually, a return to full membership. Calls for tighter ties with Europe have gathered pace alongside polling that points to a more sceptical public view of the economic gains Brexit was once projected to deliver.

Drawn from 11,461 respondents surveyed by the Messina Group across a two-week window in September, the findings placed backing for the UK's return to EU membership at 49 per cent, while opposition to that course stood at 28.5 per cent. The survey placed 52.4 per cent of participants in the camp viewing Britain's departure from the bloc as a mistake, with a further 54.9 per cent characterising the outcome of that departure as a failure.

The data gathered could lend weight to calls from within the government for a fresh look at how Britain relates to Europe. Reopening debate around the UK's departure from the European Union carries its own electoral complications, especially in areas where voters backed Leave during the 2016 vote.

Burnham has put forward the view that the UK's ties with the EU are falling short of what is needed, and that the coming decade warrants a fresh look at the available paths forward. Speaking at the Labour Party conference on 29 September, he argued that Brexit had inflicted more damage than benefit on the country and pressed for a coherent long-term framework governing ties with Britain's principal trading partner.

A planned UK-EU summit later this year is being positioned by the prime minister as an opportunity to set out the options available for moving relations forward. Options on the table span a wide spectrum — from leaving the current framework in place while easing trade restrictions, through alignment with the EU customs union or participation in the single market, all the way to seeking full membership.

No pledge to rejoin the EU immediately has come from Burnham. On being pressed about whether a future Labour manifesto might put EU re-entry to a public vote, he left open the door to that outcome.

Data gathered by the Messina Group point to backing for deeper European integration that reaches well past the question of full EU membership. Forty-nine per cent of respondents favoured a return to bloc membership, while a figure only fractionally lower — 48.2 per cent — opted for keeping the current arrangement alongside a reduction in trade barriers.

Of the three trade arrangements put to respondents, a customs union drew the broadest backing at 47.1 per cent, with associate membership and single market entry trailing closely at 45.5 per cent and 45.1 per cent in turn. Fewer than three in ten respondents — 27.9 per cent — backed the position of putting greater distance between Britain and the EU.

Trade ties with Europe retained their place among the top concerns identified by the data. When survey participants were asked to rank their country's trading relationships, roughly seven in ten placed the EU ahead of both the United States and China as the preferred partner.

Tensions tied to national autonomy, the movement of people across borders, and who holds governing authority have kept the broader discussion unsettled. Projections from the Office for Budget Responsibility put long-run productivity on a path roughly 4 per cent below where it would have tracked had Britain stayed inside the EU — a gap the body attributed to the effects of leaving.

Proponents of closer integration argue that opening up European markets and removing trade barriers could attract outside capital, raise economic activity, and bolster confidence among businesses. Any move toward re-entering the EU would involve navigating a complex set of negotiations alongside the likelihood of political concessions along the way.

Rejoining as a full member would mean taking on EU rules and obligations, with the exact conditions shaped by whatever terms are reached through talks with member states. Polling data from the Messina Group pointed to Labour gaining anywhere from 4.3 to 7.4 percentage points in vote share across various closer-ties scenarios, provided the party adopted a stance more favourable to European engagement.

A portion of Labour's parliamentary membership has expressed reluctance to reopen the fault lines that ran through the 2016 referendum campaign. Several opposition parties — among them the Conservatives and Reform UK — have taken issue with the government's handling of the matter, arguing that any move toward closer alignment would require a fresh public vote.

Rejoining the EU stands as an option under discussion rather than a commitment the government has formally adopted. Attention at the governmental level has turned to mapping out a durable arrangement with Europe, with trade, security, and shared-interest cooperation all part of the agenda being pursued.

Both Macron and Sánchez have put their weight behind the idea of a British return, with the two leaders independently voicing openness to the prospect. Any country seeking to re-enter the bloc would be required to submit a formal application, secure unanimous backing from all member states, and then work through both membership negotiations and ratification procedures before rejoining.

Voting intentions, party manifestos, and unease over living costs have each moved in ways that keep Brexit woven into ongoing arguments about the nation's direction.