A migrant has returned to the UK on a small boat after being removed to France under the "one in, one out" scheme less than a month ago, BBC News understands.
The Guardian newspaper reported that the man claimed to have been been a victim of modern slavery at the hands of smuggling gangs in France.
The Home Office declined to directly confirm the report but said a migrant had been detained and their removal was being sought as soon as possible.
Forty two people who arrived in the UK illegally have been removed so far under the scheme in which the UK agrees to take in asylum seekers who have a case for protection.
The BBC understands the man is an Iranian national, and was initially detained on 6 August and was removed on 19 September, becoming the third person to be sent to France under the scheme. He returned four days ago on 18 October.
