Campaigners demanding the return of Guantanamo Bay detainee Omar Deghayes arrived at 10 Downing Street yesterday after a 60-mile walk from Brighton.

Glenn Williams and Sally Griffiths said they hoped their three-day trek would bring the plight of Mr Deghayes, a Brighton resident, to the attention of the Prime Minister.

They delivered protest letters to Tony Blair and a giant postcard to Foreign Secretary Margaret Beckett.

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Mr Deghayes' sister Amani Deghayes joined the pair on their final few miles from Brixton to central London, along with members of Amnesty International.

She said: "My brother has been there for more than four years now and still has no idea what he is supposed to have done wrong.

"The UK has condemned Guantanamo Bay but they refuse to help Omar. It is wrong.

"It is no different to kidnapping someone and holding them against their will.

"He's been blinded on purpose and had his nose broken. He's a strong person but it's very hard to understand how anyone copes with that."

The Argus has campaigned for the release of Mr Deghayes, who has been held for more than four years without charge in Cuba, since 2005.

The postcard, which depicts a man in an orange jumpsuit on Brighton beach, was one of hundreds signed by readers of The Argus and supporters of the Save Omar campaign.

Mr Williams said: "Our 1,000 postcards to Margaret Beckett went unanswered so we thought we would make a special delivery to her.

"The UK Government is responsible for the continued detention of Omar Deghayes and it is these ministers that are barring his return."