The aftermath of the Brighton conference would confirm the Gang of Four's foreboding warning as Labour faced the gravest crisis of its history. For six miserable months, the party found itself trapped in a deeply rancorous contest for the deputy leadership. To the horror of right-wingers and the emerging "soft" inside left, Tony Benn would clench a wafer-thin victory over incumbent Denis Healey. In yet another triumphant display, the outside left secured a tide of left-wing initiatives while asserting control of the leadership. The ramifications of Benn's victory would decimate any semblance of internal cohesion within Labour. At a meeting of Consensus affiliated MPs immediately after the conference, a proposal suggesting the publication of a statement affirming loyalty to Labour was notably met with an uncomfortable silence.
Over the course of the next four months, the party would suffer a haemorrhage of defections. A total of twenty three Labour MPs would resign the whip, with the spectacle of a steady progression of Labourites settling into the SDP ranks serving to bolster the momentum of the burgeoning party. By February 1982, the SDP parliamentary group had grown from seventeen to forty-five. The defectors did not abandon Labour solely due to the events of the Brighton conference, however it was invariably a major factor. Many had come to the same conclusion as the founders of the SDP: the position of the Labour right was feeble and that a fightback had become virtually impossible. Exhaustion with the internal state of the party, coupled with the frightening prospect of the detested Benn (whose challenge was considered a forerunner to an inevitable leadership contest) being in such close proximity to the leadership, had rendered Labour intolerable for many social democrats. However the mass exodus that Labour endured did not entirely settle in the SDP, a significant number of disillusioned MPs, trade-unionists, members, activists and councillors, opted to retire from politics, reasoning that a further breakaway would only serve to the benefit of the Conservatives or end up strengthening the Labour left.
On the second October, twenty eight MPs would convene at Westminster Hall. Spearheaded by Consensus chairmen Peter Shore and Roy Hattersley, the meeting had been called to discuss the prospect of a "UDI" within the PLP, in which MPs would 'secede" from the Conference and elect their own Deputy Leader. Initially having been proposed as a final resort prior to the election, the rapid developments of the annual conference had once again completely transformed the situation within Labour. Brighton had seen motions carried calling for a variety of unacceptable left wing policies to right-wingers. Most alarmingly the Conference's commitment to the future "democratisation" of NEC and Parliamentary Committee/Shadow Cabinet elections was presumed to entail reforming the elections to be voted on by the conference/the rank and file membership. This proposal would almost certainly produce an ostensibly left-wing Shadow Cabinet and NEC, while diluting the sovereignty of the PLP. Furthermore as a majority of the PLP had voted against Benn, his victory was perceived as an imposition on MP's contrary to their own preference. Right-wingers would argue this set a dangerous precedent, vindicating their previous reservations against the electoral college.
The participants, later dubbed the "Secessionists," at the meeting would come to the agreement that the only way to counter the outside left's consolidation of power and to prevent the further dilution of the PLP's authority was to take radical action. Calls existed for a "hard" secession, advocates of such favoured a total breakaway of the PLP, in which MPs would elect their own Leader and Deputy, while recognising Benn and Foot solely in their capacity as members of the NEC. Others would propose a "soft" secession, in which the PLP would proclaim loyalty to Foot yet would elect its own Deputy leader. It was recognised however that any sort of attempt to contest the results of the college would be extremely ill-received by the rank and file membership and the Labour left as whole. Without left-wing support, the proposed PLP election could be perceived as a right-wing coup therefore diminishing its legitimacy. As a result the softer approach would be favoured in an attempt to attract a broader group of support, seeking to appeal to inside left MPs with like-minded views on parliamentary sovereignty. With an emergency session of the PLP scheduled for the fifth of October, rapid preparations would begin in drafting an open letter/statement to submit to Foot, the NEC and the national press.