Cameron’s attitude to Parliamentary corruption: When he brought in the Lobbying Act, it ensured that rich corporations had unfettered access to MPs and the Prime Minister himself.

The Labour Party is banning its MPs from holding paid directorships and consultancies, to ensure that their only interest is their duty to their constituents.

Labour MPs and Prospective Parliamentary Candidates have been put on notice that, from the coming General Election, the party’s standing orders will be changed to prevent them holding such second jobs.

The measure, which Ed Miliband has confirmed will be included in the party’s manifesto, would ensure no Labour MP holds a paid directorship or consultancy.

Labour is also consulting on legislative measures including placing a strict cap – similar to one that exists for members of the US Congress – on any additional money they can earn beyond their salary as representatives of the people.

Mr Miliband’s actions follow a series of allegations over recent years, about how MPs from both sides of the House of Commons have risked a conflict of interest by seeking or taking paid work from outside organisations.

Most recently, former Foreign Secretaries Jack Straw (Labour) and Sir Malcolm Rifkind (Conservative) were secretly filmed apparently offering their services to a private company for cash.

It is claimed Mr Straw – a major figure in New Labour – said he had used his influence to change EU rules on behalf of a firm which paid him £60,000 a year.

Sir Malcolm Rifkind, who is chairman of Parliament’s Intelligence and Security Committee, is reported to have told reporters posing as representatives of a fake Chinese firm that he could arrange “useful access” to every British ambassador in the world.

Mr Miliband has written to Tory leader David Cameron, challenging him to impose on Conservative MPs the same restrictions as are being placed on Labour’s.

The letter states: “I write … not just as leader of the Labour Party but as someone who believes that we all need to act to improve the reputation of our Parliament in the eyes of the British people.

“The British people need to know that when they vote they are electing someone who will represent them directly, and not be swayed by what they may owe to the interests of others.”

He added that Labour “is also consulting on legislation to make this a statutory ban, as well as imposing a strict cap on all outside earnings by MPs”.

Vox Political applauds this move by Mr Miliband and Labour.

Long-term readers may remember this site’s e-petition, on the government’s website, to ban MPs from speaking or voting in debates on matters which could lead to them, companies connected with them or donors to their political party, gaining money.

Labour’s move goes further than that, by banning MPs from having any financial connection with commercial operations and interests.

It seems unlikely that Mr Cameron will do the honourable thing, though.

He has removed the party whip from Rifkind, but said he has no control over the chairmanship of the Intelligence committee. Rifkind has stated that he will not willingly step down from it.

Cameron said he approves of MPs having second jobs.

He said Labour would allow someone to be a trade union official but not “to run the family shop” or something similar, which is a gross misinterpretation of the issue.

This is not about running family shops; it is about taking money from huge corporations, to impose commercial priorities on the nation to the detriment of the general public. But Cameron will never admit that, or speak out against it.

He supports it.