The father of one of the Britons being held at Guantanamo Bay in Cuba has said not enough is being done to secure his son's release.

Riasoth Ahmed's son Ruhl has been held for more than a year without charge.

He is one of three men from Tipton, in the west Midlands, who are among 600 people from 40 countries being detained at Camp Delta.

He is an innocent man. He should be released Riasoth Ahmed

A lawyer who is defending the Britons is calling on the UK Government to make written representations to the American Supreme Court.

But the Foreign Office told BBC News Online it was pressing the US to decide the future of the detainees.

Last month marked the year anniversary of America setting up the camp for suspected Taleban and al-Qaeda fighters captured in Afghanistan and Pakistan following 11 September.

America has argued the detainees are "unlawful combatants" meaning they have no right to legal representation or family visits.

No information

Mr Ahmed told BBC Radio 4's Today programme that his repeated requests for help from the Foreign Office had been largely ignored.

He continued: "We send a lot of letters to Cuba. He wants to say something to us but I don't know what he wants to say".

He said letters from his son had been censored.

Shafiq Rasul is among those being held

"We don't know anything.

"I want to try to help my boy.

"He is an innocent man. He should be released."

His son was captured along with Shafiq Rasul and Asif Iqbal, also from Tipton, a year ago by US forces while reportedly fighting alongside al-Qaeda members in Afghanistan.

Mr Ahmed criticised the UK Government for not doing enough to press the US Government on the issue.

Representations made

But a Foreign Office spokesman said the UK was "encouraging" the US Government to make a decision about the detainees as soon as possible.

"We will continue to raise this issue," he said.

British officials have visited detainees four times and plan another visit.

UK Foreign Secretary Jack Straw has regularly contacted US Secretary of State Colin Powell on the matter, he added.

However human rights lawyer Louise Christian, who is representing some of the British detainees, is calling for the UK Government to make written representations to the American Supreme Court.

She told the programme: "It is not acceptable under international human rights law to be holding people without a trial indefinitely in this way."

No obligation

The Court of Appeal ruled in November that Foreign Secretary Jack Straw has no legal obligation to intervene.

But the Master of Rolls has said it is a "legally objectionable" situation.

Proceedings are currently taking place in the US and are expected to go to the Supreme Court.

Ms Christian said either the detainees should be held as prisoners-of-war or charged with a criminal offence and brought before court.

The Swedish and Pakistan Governments have already secured the release of some of their citizens.

"We are America's closest allies in the war and surely should have more influence than the other governments and should be doing a lot more for our citizens," she said.