The family of Shaker Aamer, the last Briton in Guantanamo Bay, have spoken about their heartache as he passes another landmark in US custody - 10 years held without charge or trial.

Mr Aamer, who is from Battersea and has four children with his British wife, the youngest of whom he has never met, was captured by the US in Afghanistan in December 2001 and claims he was tortured in Afghanistan before Guantanamo.

His father-in-law, Saeed Siddique, said: “In the 10 years Shaker has been there he has become old. His hair has turned white and he is very ill.

“His children are growing now and it is difficult for them. The youngest one in nine and has never met his dad. He doesn’t know why and he tells his mum ‘my father doesn’t love me because he never sees me’.”

Mr Aamer, who was born in Saudi Arabia but had indefinite leave to remain in the UK, said he was working on humanitarian projects, including building a school, when he was captured.

The US claims he was fighting with Al Qaeda. Despite never being charged with any offence, and cleared by a military commission in 2007, Mr Aamer, now 45, remains under lock and key.

Mr Siddique, 69, added his daughter [Mr Aamer's wife] had been treated for depression and hearing voices in her head since he was detained. He said: “I am worried about my wife and myself and my family. I’m not as healthy as I was 10 years ago and I worry what will happen when I am not here.

“When he was captured Shaker offered to let my daughter divorce him, but she said ‘no I will wait for you’. She is still waiting.”

The Save Shaker Aamer Campaign is again holding a demonstration to press for his release.

The group will be part of the shut Guantanamo, end 10 years of shame rally, being held this Saturday, January 7.

The event will take place at Trafalgar Square between 2pm and 4pm.