The Crown Prosecution Service (CPS) confirmed an appeal has been lodged but a High Court judge who will make a decision on the matter is yet to be assigned.

"The matter has not been sent to a judge for consideration on the papers," the Administrative Division of the Royal Courts of Justice in London said this week.

In the first instance, a High Court judge will make a decision "on the papers" submitted for the appeal and determine if there are any grounds for an appeal against the Home Secretary's decision or the Westminster Magistrates Court February ruling in favour of Modi's extradition to India to face charges of fraud and money laundering.

Following that decision, there is scope for the defence team to seek an oral hearing to plead their case. There are no certain time-frames for the legal processes involved, which could take months.

"We are waiting to see if they do apply for permission to appeal. If they are allowed to appeal then we would contest any appeal proceedings on behalf of the GOI (government of India)," a CPS spokesperson had said earlier.

Meanwhile, 50-year-old Modi remains behind bars at Wandsworth Prison in south-west London since his arrest over two years ago on March 19, 2019.

In his ruling in February, District Judge Sam Goozee said that the diamond merchant has a case to answer before the Indian courts and that the bars to extradition under UK law do not apply in his case.

As part of a very comprehensive judgment, the judge concluded that he was satisfied that there is evidence upon which Modi could be convicted in relation to the conspiracy to defraud the PNB.

"A prima facie case is established," he said, in relation to all counts of charges brought by the Central Bureau of Investigation (CBI) and Enforcement Directorate (ED) -- including money laundering, intimidation of witnesses and disappearance of evidence.

The court had also accepted that while Modi's mental health had deteriorated due to the lengthy incarceration in a London prison, exacerbated by the Covid-19 pandemic, his risk of suicide did not meet the high threshold to conclude that it would be ''unjust or oppressive'' to extradite him.

Modi is the subject of two sets of criminal proceedings, with the CBI case relating to a large-scale fraud upon PNB through the fraudulent obtaining of letters of undertaking (LoUs) or loan agreements, and the ED case relating to the laundering of the proceeds of that fraud. He also faces two additional charges of ''causing the disappearance of evidence'' and intimidating witnesses or "criminal intimidation to cause death", which were added on to the CBI case.

As witnessed in the extradition case of former Kingfisher Airlines chief Vijay Mallya -- who remains on bail in the UK while a "confidential" matter, believed to be related to an asylum request, is resolved -- there is still some way to go before Modi can be moved from Wandsworth Prison in London to Barrack 12 Arthur Road Jail in Mumbai and face trial in India.