RISHI Sunak is under investigation after facing allegations of a possible failure to declare the shares his wife holds in a childcare agency that was boosted by the Budget.

The Prime Minister joins a growing list of Tory MPs currently under investigation.

Parliament’s standards watchdog opened the inquiry into Rishi Sunak under rules demanding MPs are “open and frank” when declaring their interests.

The investigation relates to the shares Akshata Murty holds in Koru Kids, a Downing Street source told the PA news agency on Monday.

Downing Street said the Prime Minister will clarify how it was declared as a ministerial interest, rather than to the Commons.

The National:

An update to the parliamentary website on Monday showed the investigation, opened on Thursday, related to paragraph six of the MPs’ code of conduct.

Parliamentary Commissioner for Standards Daniel Greenberg opened the inquiry under rules demanding MPs are “open and frank” in their declarations.

“Members must always be open and frank in declaring any relevant interest in any proceeding of the House or its committees, and in any communications with ministers, members, public officials or public office holders,” the section reads.

A No 10 spokeswoman responded: “We are happy to assist the commissioner to clarify how this has been transparently declared as a ministerial interest.” Rishi Sunak joins five other MPs - all current or former Tories - currently under investigation by the ethics watchdog.

Last week, former cabinet minister Matt Hancock and Tory MPs Henry Smith and Scott Benton were made subject to newly launched investigations.

READ MORE: Matt Hancock one of Tory MPs investigated by Westminster watchdog

Sunak faced demands to “come clean” about his family shares last month after being questioned by MPs over why the childcare policy favoured private firms.

Appearing before the Liaison Committee, he did not mention Murty’s shares in the firm, in which she has been listed as a shareholder on Companies House.

A fortnight earlier, Chancellor Jeremy Hunt announced a pilot of incentive payments of £600 for childminders joining the profession.

Questioning why the sum doubles to £1,200 if workers sign up through an agency, Labour MP Catherine McKinnell asked if Sunak had any interests to declare.

“No, all my disclosures are declared in the normal way,” Sunak said.

Koru Kids, which is one of six childminder agencies listed on the Government’s website, welcomed the new incentives in the Budget as “great”.

At the time the possible conflict of interest emerged, Sunak’s press secretary said the interest would be included in the updated statement of ministers’ interests, due out in May.

But it seems Mr Greenberg’s investigation appears to centre on whether the Prime Minister should have declared the interest to MPs.

The list of ministerial interests has not been updated for nearly a year.

Deputy Labour leader Angela Rayner said this has “left a transparency black hole which is enabling the Prime Minister and those he has appointed to dodge proper scrutiny of their affairs”.

“If Rishi Sunak has got nothing to hide, he should commit to publishing the register before May’s elections so the public can see for themselves,” she added.

It was last compiled by Lord Geidt, who resigned as Boris Johnson’s ethics adviser after a tumultuous period under the then-prime minister.

Sunak did not appoint a successor as ministerial interests adviser until December, when Laurie Magnus took on the role.

The Prime Minister entered No 10 in October promising “integrity, professionalism and accountability at every level”.

He has since been fined by police for not wearing a seatbelt, adding to the fixed-penalty notice he was handed for a lockdown breach alongside Johnson.

Liberal Democrat chief whip Wendy Chamberlain said: “Another day and another accusation of a Conservative Prime Minister bending the rules.

“After months of Conservative sleaze and scandal, the public just want a government which is focused on the country, rather than saving their own skin.”