UPDATE: 10.06am

Caerphilly MP Wayne David has released his resignation letter he sent to Jeremy Corbyn today:

Dear Jeremy,

I write this letter in sadness. As you know, I did not vote for you to be Leader of the Labour Party but I agreed to serve on the frontbench because I believed that you could unite the Party around clear and relevant policies and provide strong leadership.

I have to tell you that I believe you have done neither. Although the EU Referendum result cannot be blamed on you, there can be no doubt that your lack of enthusiasm for Labour's campaign was a significant handicap. I am also deeply concerned that you and your office made sustained efforts to dilute the Party's positive message during the Referendum campaign.

Having said this, I still hoped that your response to the Referendum defeat would have demonstrated that you understood the concerns of traditional working-class communities and that you would provide a leadership which would address those concerns. Unfortunately, this has not been the case.

Given that we are likely to see a General Election in the near future, it is now clear that under your leadership the prospects for Labour are not good. It is therefore with regret that I tender my resignation from Labour's frontbench and I respectfully ask you to step-down from the leadership of the Party. As you believe is essential that we see the election of a Labour Government, I very much hope that you will do the right thing in the interest of the Party and the country.

Yours sincerely,

Wayne David MP for Caerphilly

Wayne David was the Shadow Minister of State for Justice (with responsibility for constitutional matters), Shadow Minister for the Cabinet Office (with responsibility for electoral matters) and Shadow Minister of State for Scotland.

UPDATE: 9.01am

CAERPHILLY MP Wayne David has resigned from Labour's front bench.

More than a dozen MPs have resigned from the shadow cabinet in the past two days. 

Speaking to the South Wales Argus, Mr David said: "I don't think Jeremy Corbyn has been an effective leader following the EU referendum.

"What we need is someone who can bring the Labour party together.

"He has to go for the good of the cabinet and the good of the country."