A Pakistani man captured in Iraq a decade ago has begun the latest round of a High Court fight with the UK Government after being released from detention.

Yunus Rahmatullah, 31, claims that he was falsely imprisoned and tortured and wants damages. He also wants the Government to investigate the way he was treated by British forces - and wants a judge to rule that he was treated unlawfully.

Defence and Foreign Office ministers dispute his allegations and say some elements of his legal claims should not be allowed to proceed any further.

Mr Justice Leggatt was analysing legal argument at a hearing in the High Court in London.

Mr Rahmatullah's case hit the headlines three years ago - when he was still in detention - following moves in London by British human rights lawyers.

Legal charity Reprieve said he was captured by British troops during an operation in Iraq in 2004 before being handed to United States forces, moved to Afghanistan and held in Bagram airbase without being charged.

Lawyers argued that Mr Rahmatullah was under UK control and they sought a court ruling that British ministers should either ''charge or release'' him.

The claim was analysed by judges in the High Court, Court of Appeal and Supreme Court.

Supreme Court justices refused to grant the ruling that Reprieve wanted, although one justice said Mr Rahmatullah's s transfer from Iraq to Afghanistan might have been a breach of international law.

Reprieve, which has represented Mr Rahmatullah alongside law firm Leigh Day, said he spent 10 years in Bagram without charge before being released this summer and returning to Pakistan.

"It is an unimaginable ordeal that he has been put through," said Reprieve legal director Kat Craig. "The UK Government must fully investigate their role in this."