Three senior members of Your Party have issued a statement saying any donations made to the group “are safe” and suggested that people who want a refund will be eligible for one.

Former North of Tyne Mayor Jamie Driscoll, former Labour MP Beth Winter and the London-based former South African National Assembly member Andrew Feinstein, said they were “exasperated” and had “tried to mediate between Jeremy and Zarah for some weeks now”.

They added: “In blunt terms, we demanded a meeting to get it sorted. One side agreed, the other has not responded despite multiple attempts.”

They said a company, which is called MOU Operations, had been set up in their name to be the “custodian of the donations”.

According to documents on Companies House, MOU Operations was set up in April this year, more than two months before Corbyn announced he was launching a new party.

Driscoll, Winter and Feinstein said they would “speak to Jeremy and Zarah and make sure the mechanism for any refunds is shared with you”.

They added: “All the donations encouraged by both Zarah and Jeremy, or anyone else, went into this bank account, with their approval.

“The recent email launching a membership system uses exactly the same payment system, and goes into the same bank account.”