The JC understands that Jeremy Corbyn, Jennie Formby and Seumas Milne have instructed lawyers to complain to the Labour Party about the party's proposed settlement of its libel suit from whistleblowers featured in the BBC's Panorama last July.
High Court listings for Wednesday appear to confirm that Labour is ready to publicly apologise to the BBC Panorama antisemitism whistle-blowers who sued the party for libel after the programme was aired last year.
Court listings suggest statements by lawyers representing the Labour Party are due to be read out in open court in the cases of seven whistle-blowers and also that of John Ware, the Panorama reporter who also sued the party after Labour said he had deliberately set out to mislead viewers.
The listing confirms this will take place at Court 14 in the Queens Bench Division of the High Court before Mr Justice Nicklin at 10 am.
But the JC understands that Mr Milne is claiming that the Labour Party has breached the terms of his departure agreement – that the party would keep him informed about the progress of the case and they did not.
Allies describe the three as "livid" that there has been a settlement.
Their lawyers are demanding to see the proposed Statement In Open Court prior to the scheduled time.
The JC understands that this last minute legal action is being funded by Unite.