THERESA May was asked to tell MPs why two men at the heart of allegations over Brexit referendum cheating were invited to Downing Street for a secret meeting.

The Tory leader was probed on the issue by SNP MP Deidre Brock during Wednesday’s Prime Minister’s Questions.

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It followed a report by Channel 4 News broadcast earlier this year that revealed Jeff Silvester, and Zack Massingham of AggregateIQ had visited Number 10.

Questions have long been asked about the business who in April 2016 had no web presence and no track record of success but still became the Brexiteers data firm of choice.

Over the final two months of the EU referendum campaign, Vote Leave, the DUP, Veterans for Britain, and BeLeave, a little known campaign group led by a 23-year-old fashion student named Darren Grimes, spent over £3.5 million with AggregateIQ.

The official Vote Leave campaign, fronted by Boris Johnson and Michael Gove, spent 40% of their total campaign budget with the obscure Canadian firm.

Whistleblower Chris Wylie has claimed that all the Leave groups were working together, breaking the UK’s strict laws on coordination and spending between campaigning organisations.

The rules are designed to ensure that no one can get around campaign spending limits by setting up front groups.

AggregateIQ has long said it has done nothing wrong and has followed the law.

On Wednesday, Brock said she had raised these questions with May before.

“The Prime Minister refused to answer my written question about AggregateIQ visiting Downing Street so I will ask her here,” the MP said.

“Why did Jeff Silvester and Zack Massingham of AggregateIQ visit Number 10 last autumn? Who did they meet? who invited them? What was the purpose of the meeting, and most importantly, why was the meeting not recorded in the transparency database?”

Brock had first tabled the exact same question to May back in April, but all Downing Street would say then was that the transparency data “relates to official meetings with external organisations and individuals.”

Yesterday in the Commons, May told Brock: “Her letter has not be drawn to my attention. But following her question I will ensure that she receives a reply in writing.”

Commenting afterwards, Brock said: “There are serious questions to be answered by the Prime Minister over the UK government’s shady meetings and relationship with AggregateIQ – a company with links to shamed firm Cambridge Analytica, and at the centre of allegations of election spending violations.

“The Prime Minister’s dodging of my question today – on top of the lack of response to my written questions from March – is not a good look and raises further questions.”

She added: “Not recording a visit in the transparency data register is a serious breach of the rules and we must now be told what lies behind this. Invitations to Downing Street are not offered on a whim – Theresa May must come clean.”

Earlier in the session, SNP Westminster leader Ian Blackford told May she “was unfit to govern and incapable of leadership”.