"I failed to update in time my initial registration in respect of payments received from my previous employer during the months of June to October 2010.

"This I have now done.

"I also failed to declare an interest in speaking in two debates on 16th June and 16th September 2010.

"Notwithstanding that the Commissioner found, and the Committee noted, that the breaches were unintentional, I want to apologise unreservedly to the House, and I will in future fully abide by the rules of the House."

It follows the publication of a report the Commons Committee on Standards and Privileges, which found the Labour MP had broken Parliament's rules by waiting almost a year to reveal full details of payments.

Mr Dromey was Deputy General Secretary of trade union Unite when he was elected to become MP for Birmingham Erdington in May 2010.

But he stated in the Commons Register of Members' Interests: "I am leaving this position and have declined my salary in the meantime."

In fact, Mr Dromey continued working for the union for between 10 and 15 hours a week until 30 October 2010 - and was paid a salary.

He then received another £30,000 on November 5 2010 as an ex gratia payment from the union.

Under Commons rules, MPs need to register any payments from outside sources within four weeks. But Mr Dromey failed to register the £30,000 until July 2011, and failed to register the salary he had received until October 4 2011, when he revealed he had been paid £27,867.

The official MPs' watchdog John Lyon, The Parliamentary Commissioner for Standards, found him guilty of breaking Commons rules by failing to declare the payments - and by failing to tell MPs about his relationship with Unite when he spoke in two Commons debates in 2010.

But the Committee on Standards and Privileges, said it accepted Mr Dromey's offer to apologise to the Commons and pointed out in a report to MPs that he had been "a new and inexperienced Member at the time". No further action will be taken.