Latest developments:
Former shadow cabinet member Tristram Hunt has become one of the latest Labour MPs calling for Jeremy Corbyn's removal as leader of the party in the wake of the Brexit vote.
Writing in The Observer, Mr Hunt wrote: "As we face the prospect of a Tory-driven Brexit and another general election, our experiment with Corbynism has to end."
"We need a leader who can hold Boris Johnson to account, stand up for Labour voters and be ready to walk through the door of Downing Street in as little as a year's time," the Stoke-on-Trent Central MP added.
The leader of the UK's biggest trade union has said the country is 'riven' as a result of the EU referendum.
Len McCluskey told ITV News that the trade unions can help broker a peace deal and reunite the party now the "coup has failed".
Labour leader Jeremy Corbyn said he would 'reach out' to MPs that oppose his leadership but said they should 'respect democracy'.