The leader of Britain's opposition said he would not support Prime Minister Theresa May's new attempt to push through her Brexit bill if it was fundamentally the same as the bill that had been defeated three times before.

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"We haven't seen whatever the new bill is going to be yet but nothing I've heard leads me to believe it is fundamentally any different from the previous bill that has been put forward so as of now we are not supporting it," Jeremy Corbyn told the BBC's Andrew Marr show on Sunday.

“It has become clear that, while there are some areas where compromise has been possible, we have been unable to bridge important policy gaps between us," Corbyn wrote. “Even more crucially, the increasing weakness and instability of your government means there cannot be confidence in securing whatever might be agreed between us.”

May said in the Sunday Times she would present a "new bold offer" to lawmakers with "an improved package of measures" in a final attempt to get the Brexit Withdrawal Agreement Bill through parliament before she leaves office.

The Labour Party, led by Corbyn, said the government has been unwilling to compromise with them, while also pointing out that May's imminent departure meant that there was no guarantee that any promises would be lived up to by the Conservatives. 

May's successor, Boris Johnson, has spoken about the Brexit negotiations, but it remains unclear if he will follow the policies of his predecessor.