A senior Labour figure has warned that his party is in danger of “echoing” Theresa May’s Brexit mantras unless it does more to reflect the views of its members across the country.

Ex-shadow cabinet minister Chuka Umunna said his party’s current approach of pushing for further negotiation if the deal Ms May achieves is not good enough is not credible.

He spoke out after Shadow Brexit Secretary Sir Keir Starmer was said to have told MPs that they should stop “looking back in grief” and try to make the best of Brexit.

But Mr Umunna instead pointed to a major intervention from top EU figures Donald Tusk and Jean-Claude Juncker in which they said Britain could still “change its mind”.

After Sir Keir told Labour MPs a “number of obvious difficulties” with a second referendum and that trying to “rub [Brexit] out” would mean the party failing to fight for a good deal, Mr Umunna hit back.

He argued that flaws and shortcomings in the Brexit deal Ms May agrees would become clear, and at that point before March 2019 people would want another say.

Currently Labour is calling for a meaningful vote in parliament on Ms May’s deal, and then for her to renegotiate it if the Commons fails to back it.

Brexit: the deciders Show all 8 1 /8 Brexit: the deciders Brexit: the deciders European Union's chief Brexit negotiator, Michel Barnier Getty Brexit: the deciders French President Emmanuel Macron Getty Brexit: the deciders German Chancellor Angela Merkel Reuters Brexit: the deciders Commission President Jean-Claude Juncker EPA Brexit: the deciders The European Parliament's chief Brexit negotiator Guy Verhofstadt Getty Brexit: the deciders Britain's Prime Minister Theresa May Getty Images Brexit: the deciders Britain's Chancellor of the Exchequer, Philip Hammond PA Brexit: the deciders After the first and second appointed Brexit secretaries resigned (David Davis and Dominic Raab respectively), Stephen Barclay is currently heading up the position PA

But Mr Umunna said: “At the time that we are presented with a deal to vote on, I strongly suspect the EU institutions will say ‘there is no more time for negotiation, it is this deal or the status quo’.

“The Labour party is in danger of labouring under the mistaken belief that we will be able to credibly say ‘go back and negotiate further.”

He suggested that if Parliament rejects Ms May’s deal it is more likely that the UK will crash out of the EU with no agreement in place, meaning Labour would “unwittingly” be supporting a no deal scenario”.

Mr Umunna, a prominent supporter of the Open Britain group, added: “All I know is that members and supporters and voters expect to hear an alternative to the Brexit mantra of Theresa May, they don’t expect to hear us echoing it.”

He pointed to the “important intervention” made by Mr Tusk and Mr Juncker, which he said showed that in Europe it is politically possible for “the British people, if they wish at the end of the process, to take a different view”.

Mr Umunna added: “Brexiteers have characterised the EU institutions and other member states as wanting to punish the UK for leaving and to make an example of us.

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“But these warm comments about Britain and the clear desire for us to stay of we want to do so fly in the face of that characterisation, of them being the enemy as opposed to who they are, which is our friends.”

European Council President Mr Tusk said that EU “hearts are still open” to “our British friends” to remain in the bloc.

He was immediately backed up by Jean-Claude Juncker, the President of the European Commission.