New photos have emerged of Boris Johnson raising a glass of wine in front of a table strewn with bottles at the leaving do of a senior aid – an event for which the Metropolitan police decided not to issue the prime minister with a fixed-penalty notice ( FPN).

Others who attended the leaving do were handed FPNs during the Met's investigation, and the images will raise new questions about why Johnson escaped sanction.

The photos obtained by ITV News show Johnson holding a glass of wine as others raise their glasses, as well as appearing to give a speech. The event on 13 November 2020 was to mark the departure of his head of communications, Lee Cain.

Johnson has denied in the House of Commons that an event took place on that date. Asked by the MP Catherine West “whether there was a party in Downing Street on 13 November”, Johnson replied at the time: “Mr Speaker, no. But I'm sure that whatever happened, the guidance was followed and the rules were followed at all times."

In the photos, Johnson appears to be giving a speech to assembled aides, with his ministerial red box on the chair beside him, next to bottles of fizz and empty glasses.

A No 10 spokesperson suggested police had access to the photos. “The Cabinet Office and the Met police have had access to all information relevant to their investigations, including photographs,” the spokesperson said. “The Met have concluded their investigation and Sue Gray will publish her report in the coming days, at which point the prime minister will address parliament in full.”

Labour's deputy leader, Angela Rayner, said it was clear Johnson had lied about the event. “While the British public were making huge sacrifices, Boris Johnson was breaking the law,” she said. “Boris Johnson said repeatedly that he knew nothing about law-breaking – there's no doubt now, he lied. Boris Johnson made the rules, and then broke them.

“The prime minister has demanded his office. The British people deserve better. While Labor has a plan for tackling the cost of living crisis, Tory MPs are too busy defending the indefensible actions of Boris Johnson.”

Earlier on Monday the prime minister's former chief adviser Dominic Cummings said photos would contradict the accounts of Partygate given by Johnson to police and parliament.