Jeremy Corbyn will outline the policy shift in a speech in the coming weeks

Jeremy Corbyn will back a move today for Labour to change its Brexit policy and support a second referendum in all circumstances.

The shadow cabinet is due to discuss the plan to make Labour’s stance decisively pro-Remain. A paper drawn up by Andrew Fisher, Mr Corbyn’s head of policy, recommends that Labour support a second referendum on any deal negotiated with Brussels.

A senior Labour source confirmed that Mr Corbyn was endorsing the shift in policy, adding: “It is a moment.”

Labour’s policy at present is to demand changes to Theresa May’s deal to include a customs union or push for a general election. A second referendum is merely an “option” should those plans fail.

In last month’s European elections Labour was pushed into third