A helpline has been set up to help people regularise their immigration status following warnings they could be deported unless they can prove they are entitled to be in the UK.
It was established on Tuesday, with the Home Office saying 49 cases had been reported on the first day.
Prime Minister Theresa May has said the Government will help those who had their immigration status questioned by the Home Office resolve their situation as soon as possible.
There were fiery exchanges in the Commons between Jeremy Corbyn and Mrs May, with the Labour leader accusing the PM of callousness and incompetence over the row.
Mrs May said she had no time for lectures from a leader who allows anti-Semitism to run rife in his party and reiterated her apology to those who have been affected.
These people are British. They are part of us. I want to be absolutely clear that we have no intention of asking anyone to leave who has the right to remain here, she said.
There has also been confusion over the destruction of landing cards that recorded the arrival of Windrush immigrants to Britain.
They came to Britain from the Commonwealth after the Second World War and are named after the ship that brought one of the first large groups of West Indians to Britain.
Anyone who entered the UK before 1973 is legally entitled to live in the country.
But despite having been in the UK for most of their lives, many have begun to experience issues as a result of tightened immigration requirements.
It has seen some – who might never have felt the need to apply for a UK passport before – left without the documentation now required by officials.
As many as 50,000 are thought to be experiencing difficulties in finding work, getting NHS care, accessing benefits, or trying to secure housing.
There are even fears some may have been deported in error.
Shadow home secretary Diane Abbott is holding an event in the House of Commons on Thursday evening to bring together some of the individuals directly affected – as well as MPs, organisations that have been providing support, and representatives of Caribbean Commonwealth governments.
On Monday, Home Secretary Amber Rudd announced a 20-person team to help those affected produce evidence of their right to be in the UK.
The Home Office will also waive fees for those needing to prove their residency rights, she said.
I wouldn’t want anyone who has made their life in the UK to feel unwelcome or be in any doubt of their right to remain here, the Home Secretary said.
There is absolutely no question about their right to remain and I am very sorry for any confusion or anxiety felt.
The Home Office has set up a dedicated web page to help Commonwealth citizens confirm their status in the UK, which can be found here. Alternatively, call the Home Office helpline on 0300 123 2241.
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