A police watchdog is being urged to consider reopening a probe into Boris Johnson after fresh claims from Jennifer Arcuri about their relationship when he was London Mayor.
The American tech entrepreneur alleged that Mr Johnson overruled advice of his staff in 2013 to attend an event promoting her business and offered to be the "throttle" to advance her career.
Ms Arcuri gave a bombshell interview to the Sunday Mirror earlier this year where she said the pair were engaged in a four-year relationship between 2012 and 2016.
She claimed they read Shakespeare together before having sex on a sofa at his marital home while his then wife was away, as well as exchanging racy texts.
Ms Arcuri has now shared unpublished diary extracts with The Observer after the Prime Minister said last week that politicians who break the rules should be punished.
According to a diary entry, Mr Johnson asked Ms Arcuri: “How can I be the thrust – the throttle – your mere footstep as you make your career? Tell me: how I can help you?”.
She alleges that Mr Johnson defied advice not to promote her tech venture Innotech.
In another diary entry from February 2013, she claims he told her: “I just want you to know they came to me and I crushed them.
"They said: ‘You can’t do this Innotech in April.’ I said: ‘Yes, I can, I’ll be there.’
"I only want to do this to make you happy. How I do wish to make you satisfied.”
Ms Arcuri gave the extracts to journalist John Ware in 2019 as he worked on a documentary about the relationship.
Labour has urged the Independent Office for Police Conduct (IOPC) to “look again” at their decision to rule out a formal investigation into Mr Johnson's conduct after the publication of new excerpts.
Deputy Leader Angela Rayner has written to the Greater London Authority's Monitoring Officer to request that they refer the new evidence to the IOPC urgently.
The letter said: The diary extracts reported in the media include promises made by Boris Johnson of support for Ms. Arcuri's business linked to his personal relationship with Ms Arcuri.
"This is deeply worrying and is emblematic of Boris Johnson's approach to political leadership, which has no regard for decency or the public interest, only self-interest."
The IOPC declared in May that it would not launch a criminal investigation into whether Mr Johnson used his position while Mayor of London to benefit and reward Ms Arcuri.
Ms Arcuri was given access to three taxpayer-funded trade trips led by Mr Johnson, who also appeared at events that she organised.
Her companies also received £126,000 in public grants and event sponsorships.
The Greater London Authority oversight committee is separately investigating allegations of conflict of interest during Mr Johnson's tenure at City Hall.
Committee chair Caroline Pidgeon, who was speaking in an individual capacity as an assembly member, said the diary notes were of serious concern.
She said: “This new material from Jennifer Arcuri is significant and the IOPC may wish to consider whether they need to reopen their investigation.”
A spokesperson for the Greater London Authority (GLA) said: “The GLA’s Monitoring Officer will look at any new significant evidence that is presented in accordance with the GLA’s procedures.”
A Government spokesperson said: “As mayor, Boris Johnson followed all the legal requirements in the Greater London Assembly’s code of conduct at the time.”
The Prime Minister has previously insisted he had "no interest to declare".
However he has repeatedly dodged questions over whether he had a relationship with Ms Arcuri.
In March, his then Press Secretary Allegra Stratton said: "He acts with integrity and is honest."
The latest revelations come as a new opinion poll suggested the Conservatives had lost their lead over Labour amid an ongoing row over sleaze allegations.
Some 37% of voters backed Labour in a new Opinium survey - one point ahead of the Tories on 36%.
More than 2,000 UK adults were surveyed between Wednesday and Friday.
