Figures issued by the Home Office showing that only 50 Ukrainian refugees had been given visas to come to the UK were “absolutely innacurate”, Priti Patel has said.

In an extraordinary development, the Home Secretary said the true figure will not be known until this evening.

Her comments came following intense criticism over the apparent failure of the UK’s refugee scheme to admit enough people fleeing war in their homeland.

Addressing MPs as she launched the Economic Crime Bill, which is aimed at cracking down on Russian oligarchs, the home secretary said: “It’s important for all colleagues in the house to know that the first quality assured figures on the Ukrainian families scheme will come this evening.

“The figures that are in the public are absolutely inaccurate and have not been assured by the Home Office, so I do just want to make that abundantly clear.”

She added: “Our scheme is the first of its kind in the world and we cannot measure it against any other countries.

“We have had already 14,000 people apply, we also have a sponsorship scheme that will be announced later on.”

The Home Office issued an update later on Monday saying 300 visas had been confirmed and 17,700 applications made.

Patel is also at odds with Boris Johnson after she appeared to suggest that a third refugee scheme, aimed at allowing more Ukrainians to arrive on humanitarian grounds, was being set up.

Priti Patel has defended the government’s Ukrainian refugee scheme as it emerged that only around 50 visas have been granted since it was set up.

Some 5,535 applications have been completed and submitted online, the Home Office said, while a further 2,368 people had booked a visa appointment to submit their application and biometric information.

In addition, 11,750 people have started but not completed an online application.

Under the government’s scheme, Ukrainians with family members in the UK can apply to stay in this country for up to three years.

Boris Johnson has said that around 200,000 Ukrainians could benefit from the scheme.

The home secretary has previously rejected calls for all refugees to be offered visas, blaming security concerns.

Visiting the Ukrainian Social Club in Holland Park, London, Patel insisted everything was being done to process as many applications as possible.

She said: “Let’s be clear, this is the first scheme in the world that’s up and running in this short period of time.

“Ten thousand applications and yes, grants are happening as we stand here right now and are speaking.

“So I’m surging staff across all application centres across the entire European Union as well as in the border countries such as Poland, where I was the other day and obviously where huge numbers of people are coming through.”

Patel added: “This is an incredible scheme and we are doing everything possible, surging capacity across every single application centre across the EU.”

She said staff are being flown into border countries “so we can fast track and speed up applications and it’s right that we do this.”

Patel also hit back at French interior minister Gerald Darmanin, who accused the UK of a “lack of humanity” amid reports that 150 Ukrainians were turned away at Calais for not having visas to enter Britain.

The home secretary said: “Let me just correct what has been said by the French government. The British Government is not turning anybody around or turning anybody back at all.

“And I think it’s really important to emphasise that, particularly at this time, when all nations across Europe must work together to help and support people in need and fleeing Ukraine at this awful, awful time.”

Meanwhile, Ukraine’s ambassador to the UK, Vadym Prystaiko, said the visa process for refugees fleeing his homeland for the UK could be simplified.

Speaking outside the Ukrainian embassy in west London, he said: “We believe that some of the procedures can be really simplified.

“We will sort it out later, now we have to let as maximum people we can have as possible.

“All the security checks should be in place for obvious reasons because it is a war.”

But he said he believes the UK is “on the forefront of the effort” to help Ukraine.