Campaigners will bring the plight of Guantanamo Bay detainee Omar Deghayes to the attention of the Government today.

The Save Omar group is demanding the return of Mr Deghayes, a Brighton resident, to Britain.

The group's Brighton to London "Free Omar" walk will end at Downing Street today.

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They will deliver protest letters to Tony Blair and a giant postcard to Foreign Secretary Margaret Beckett, a copy of one of the 1,000 signed by Brighton people they claim she has ignored.

Mr Deghayes is a Libyan who sought political asylum in England following the death of his father, a trade union activist, in the Eighties. He settled in Brighton and has a wife and child.

The 37-year-old was arrested in Pakistan in 2002 and has been incarcerated at Guantanamo for four years.

His family believe he has been blinded in one eye following rough treatment and the use of pepper spray.

In October, the Court of Appeal rejected his family's bid to force the Government to demand his return.

Appeal court judges rejected the argument that Mr Deghayes, who has indefinite leave to stay in Britain, should be treated as a UK citizen in spite of being a foreign national.

All British citizens who were detained at Guantanamo have been returned to the UK.

Save Omar spokesman Glenn Williams said: "We hold Tony Blair and his ministers responsible for the continued detention and torture of Omar Deghayes.

"The United States has offered to release him. British officials know he does not pose a security threat, so it is only the Government ministers barring his return."

The letter to the Prime Minister states that Mr Deghayes' detention is a breach of human rights and calls for his immediate release.

Supporters attending the walk include Amani Deghayes, Mr Deghayes' sister, Walter Wolfgang, the pensioner who was famously thrown out of last year's Labour Party conference for heckling, and members of Amnesty International.

Campaigners plan to arrive in Parliament Square, London, at 1.30pm