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A Â鶹¹ÙÍøÊ×Ò³Èë¿Ú investigation has raised fresh doubts about the evidence used to throw thousands of people out of the UK for allegedly cheating in an English language test.

Whistleblower testimony and official documents obtained by Newsnight reveal the Home Office has continued to try to remove people based on the claims of the international testing organisation ETS - despite knowing of serious concerns about its conduct and flaws in its data.

More than 2,500 people were deported and at least 7,200 more were forced to leave Britain after ETS accused them of cheating in an exam it set and marked. Others who remain in the UK continue to fight to clear their names after enduring years of hardship.

Richard Watson reports.