Boris Johnson has said MPs who break parliamentary rules on second jobs “must be investigated and should be punished”.

In the last week, the government has come under fire over its backing of former MP Owen Paterson, who was found to have breached rules on lobbying.

It has since emerged that former attorney general Sir Geoffrey Cox earned more than £800,000 while working as a barrister for law firm Withers, which is representing the British Virgin Islands (BVI) government in a corruption case brought by the UK government.

Speaking at the COP26 summit in Glasgow, the prime minister said he did not want to comment on individual cases.

But he added it is “crucial” MPs follow the rules, and said parliamentarians should “put your job as an MP first and devote yourself primarily to your constituents”.

Mr Johnson said for “hundreds of years” MPs have also had other jobs and he thinks that has strengthened the UK’s democracy because voters “feel parliamentarians need to have experience of the world”.

“But if that system is to continue today, it’s crucial MPs follow the rules,” he warned in his strongest words on the issue yet.

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“You must put your job as an MP first and you must devote yourself primarily and above all to your constituents, the people who send you to Westminster, to parliament.”

He said MPs should not use their position to lobby on behalf of an outside interest.

Mr Johnson told Sky News’ political editor Beth Rigby: “I feel strongly those who do break the rules, who are not putting the interests of their constituents first, they should face appropriate sanctions and punishment.”

Many MPs will believe it’s a bit rich for Boris Johnson to declare that MPs who break the rules in parliament should be punished.

A week ago he ordered his MPs to vote against punishing Owen Paterson after the Standards Committee said he was guilty of an “egregious” breach of the rules.

He also proposed the axing of the committee and replacing it with another one, this time with a Tory majority and chaired by an MP who used to be his wife’s boss.

Then on Monday, after a humiliating U-turn that prompted Mr Paterson to quit as an MP, the prime minister dodged a Commons debate on sleaze in which some of his own MPs protested bitterly against his handling of the controversy.

But at his COP26 Glasgow news conference, clearly prepared for sleaze questions, he suggested – not entirely convincingly – that he wouldn’t tolerate rule-breaking on “second jobs and all that” in future.

He insisted the UK was “not remotely a corrupt country” and when asked about his own affairs – the Downing Street flat makeover and his Marbella freebie holiday – mumbled, again unconvincingly, that he had conformed with the rules.

Yet once again there was still no apology for the whole fiasco, prompting Labour’s tenacious deputy leader Angela Rayner immediately to accuse him of “taking the mickey” and ensuring this sleaze row won’t go away.

But Labour’s deputy leader Angela Rayner said Mr Johnson’s refusal to apologise for the Paterson affair “proves that he doesn’t care about tackling the corruption that has engulfed Downing Street, his government and the Conservative Party”.

She accused the PM of “taking the mickey out of the British people” and refusing to “clean up his mess”.

“He thinks it’s one rule for him and another rule for everyone else,” Ms Rayner added.

Sir Geoffrey has defended his extra earnings, with a statement on his website saying “he does not believe that he breached the rules”.

The MP’s office said: “Sir Geoffrey regularly works 70-hour weeks and always ensures that his casework on behalf of his constituents is given primary importance and fully carried out”.

It has been revealed that he voted by proxy in the House of Commons while earning hundreds of thousands of pounds for the legal work more than 4,000 miles away in the Caribbean.

According to his entry in the register of members’ financial interests, Sir Geoffrey did approximately 434 hours of work for Withers between January and July this year, at an average of more than 15 hours per week.

Sir Geoffrey took part, by proxy, in Commons votes this year on the cladding scandal and on protecting the UK’s steel industry.

And, by taking advantage of the Commons allowing widespread proxy voting – introduced due to the COVID-19 pandemic – Sir Geoffrey was also able to appear at a corruption inquiry held in the British Virgin Islands, a British Overseas Territory, on the same day those votes were held.

Sir Geoffrey is also facing claims he used his parliamentary office to undertake some of his work for Withers after footage appeared to show the MP using his Commons office to carry out a Zoom session of the BVI Commission of Inquiry.

Asked about Sir Geoffrey’s conduct, Speaker Lindsay Hoyle said: “He’s broken no rules but we’ll all be judged by the electorate, including that said member.”

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