After Tuesday night’s crushing defeat for Theresa May’s Brexit deal, there is perhaps one thing on which almost all MPs can agree: there is no obvious consensual route forward. Following are the main possibilities, the obstacles they face and an educated guess at how much support they might command. Most of them would probably involve an extension of article 50 beyond the 29 March deadline. Revoking article 50 is also possible, but unlikely without a second referendum.
Tweaked version of May’s deal
This appears to be the prime minister’s current choice: use the heavy loss to go back to Brussels and beg for another concession on the Irish backstop. The problem is that the only changes to the mechanism that would change minds – a guaranteed end date and/or a unilateral pull-out mechanism – have been definitively ruled out by the EU.
Likely support in Commons: little more than the 202 seen on Tuesday if May secures no real changes.
No-deal departure
This is still the default option if MPs find no other way out – a departure on 29 March and a switch to trading on World Trade Organisation terms. However, the Commons has already shown there is a clear majority against this happening, by backing Labour MP Yvette Cooper’s amendment seeking to prevent it happening. And plenty of senior Conservatives have made it clear they would back action to prevent May from pushing ahead with this.
Likely support in Commons: perhaps fewer than 100 would accept it; many fewer want it as a stated ideal choice.
Norway-plus/single market/Efta
These options are closely interlinked, if not the same – for example, the “plus” in Norway-plus refers to the intention of keeping the UK in a customs union as well as a single market, either permanently or until a solution to the Irish border issue can be found. Norway is among the four members of the European Free Trade Association (Efta) – as was the UK before it joined the then-European Economic Community in 1973. Such versions of Brexit would limit economic damage, but require continued freedom of movement for people, which is politically difficult. Also, senior Norwegian politicians have said they would not welcome the UK re-entering Efta.
Likely support in Commons: extremely hard to say. Perhaps around 200, made up mainly of Labour MPs, plus some Conservatives and the Scottish National party. It all depends on the other options on the table.
Customs union
To be precise, “a” customs union, as Labour term it, to distinguish it from “the” existing one based around the EU. Labour, the main proponent of the idea, says it would help businesses with supply chains and solve the Irish border issue. May argues that it goes against the referendum result as it would preclude the UK signing its own trade deals.
Likely support in Commons: most of Labour’s 256 MPs would back this in a whipped vote. Support from others would depend on the rival options on offer.
Second referendum
Otherwise styled as a “people’s vote” by one of the groups advocating it, arguing it would not merely be a repeat referendum but a fresh choice now that the facts of Brexit are known. On the plus side, it would end the deadlock in parliament. Negatives include considerable complexities on timing and vote mechanics, and the bad feeling it could stir in leavers who insist the matter was settled in 2016.
Likely support in Commons: extremely hard to say, anything from 170 to 300, depending on a variety of factors, including whether Labour adopts the plan, and the other options.