Prime Minister Boris Johnson and Chancellor Rishi Sunak are both expected to receive fines amid an investigation into lockdown parties at Downing Street.

The duo will be issued with fines for breaches of Covid-19 regulations following allegations of lockdown parties in Downing Street and Whitehall, a No 10 spokeswoman said.

The spokesperson said: “The Prime Minister and Chancellor of the Exchequer have today received notification that the Metropolitan police intend to issue them with fixed penalty notices.

“We have no further details, but we will update you again when we do.”

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More than 50 referrals for fines have been made off the back of lockdown parties at Downing Street and Whitehall, Police have said.

The Metropolitan Police said at least 30 more fixed penalty notices will be issued by the ACRO Criminal Records Office. This is up from the 20 referrals for fixed-penalty notices (FPN) the force said had been made at the end of March.

Scotland Yard said it was “making every effort to progress this investigation at speed”, with the possibility of more fines to come.

Liberal Democrat leader Sir Ed Davey said: "These fines expose the shocking scale of the criminality in Boris Johnson's Number 10.

"The police have now completely shredded Johnson's claims that no laws were broken. He cannot be trusted and cannot continue as Prime Minister.

"No other leader in any other organisation would be allowed to continue after law-breaking on this scale.

"If Boris Johnson won't resign, Conservative MPs must show him the door."

In response to news that police investigating allegations of lockdown parties held in Downing Street and Whitehall have now made more than 50 referrals for fines, bereaved families said it is "indisputable" that widespread rule breaking occurred.

Calling on the Prime Minister to resign, Matt Fowler, co-founder of Covid-19 Bereaved Families for Justice, said: "There you have it - it's now indisputable that whilst bereaved families were unable to be at their loved ones' sides in their last moments, or stood at their funerals alone, the people responsible for protecting us in Downing St were partying and rule breaking en masse.

"It's a reality that is unbelievably painful for bereaved families like mine to face as we try and move forward with our lives.

"It's plain as day that there was a culture of boozing and rule breaching at the highest level of Government, whilst the British public was making unimaginable sacrifices to protect their loved ones and communities."

Labour deputy leader Angela Rayner has denounced "widespread criminality at the heart of Downing Street".

Responding to the Met Police announcing that over 50 referrals have now been made for fixed penalty notices for breaches of Covid-19 regulations in Downing Street and Whitehall, she said: "Crime is soaring, victims are being let down, and police officers are disappearing from our streets - now we see widespread criminality at the heart of Downing Street.

"This is just the latest example of a distracted out-of-touch Government, guilty of breaking the law, never mind enforcing it.

"Labour has set out a plan to crack down on crime and anti-social behaviour by making offenders pay back to communities and tackling antisocial behaviour with police hubs in every area. Meanwhile, the Conservatives are defending their own law-breaking and are refusing to distance themselves from one of their MP's defence of a convicted sex offender.

"Britain deserves better than this Government."