Jeremy Corbyn and 18 other Labour MPs have signed a letter calling for David Cameron to back the organisation of a European conference “to agree debt cancellation for Greece.”

Corbyn, who is in the running to be Labour’s next leader, has signed this letter along with 18 other Labour MPs – including London mayoral hopeful Diane Abbott. Four general secretaries from Labour affiliated trade unions have also put their name to this letter: Len McCluskey, from Unite; Frances O’Grady, from the TUC; Paul Kenny, from GMB and Manuel Cortes, of the TSSA.

They argue that “there must be an end to the enforcing of austerity policies that are causing injustice and poverty in Europe and across the world.” Signatories say they “urge the creation of UN rules to deal with government debt crises promptly, fairly and with respect for human rights, and to signal to the banks and financiers that we won’t keep bailing them out for reckless lending.”

This comes as people in Greece will vote in a referendum on Sunday to decide whether they will agree to the terms the country has been offered by international creditors for receiving bailout money.

The list of Labour MPs to sign this letter reads as follows:

Diane Abbott MP

Dave Anderson MP

Richard Burgon MP

Jeremy Corbyn MP

Roger Godsiff MP

Harry Harpham MP

Carolyn Harris MP

Ian Lavery MP

Clive Lewis MP

Rebecca Long-Bailey MP

John McDonnell MP

Liz Mcinnes MP

Rachael Maskell MP

Michael Meacher MP

Grahame Morris MP

Kate Osamor MP

Cat Smith MP

Jo Stevens MP

Catherine West MP