Oliver Conway

Abu Zubaydah was the first man subjected to the CIA's so-called enhanced interrogation techniques after the 11th September 2001 attacks.

When captured by the US in Pakistan in 2002, it was claimed he was a senior al-Qaeda member.

He was held for four years at secret CIA detention centres where he was interrogated and tortured, including through simulated drowning, beatings and being locked in a coffin.

MI6 and MI5 passed on questions to be put to him.

he brought a legal claim against the UK on the basis that its intelligence services were complicit in his torture.

The case has now reached a settlement, with Abu Zubaydah paid a substantial sum of money.

The US no longer says he was in al-Qaeda.

but he remains in the Guantanamo Bay prison camp after two decades, without charge or convictions.

His lawyers are now urging the UK and other governments that share responsibility for his treatment to ensure his release.

The Foreign Office, which oversees MI6, said it would not comment on intelligence matters.

People with a rare form of blindness have had their sight restored using a low-cost gel.

The treatment can reduce the effects of hypotony, where pressure in the eyeball is too low and leads to distorted vision.

Our health correspondent Sophie Hutchinson has been speaking to one of those affected and lead researcher Dr Harry Petruskin from the Moorfields Eye Hospital in London.

the obvious thing to do would be to pump it up, because if you have a ball that deflates, you pump it up, and if you have a bike tyre that deflates, you pump it up.

But what you really need to do for vision is to pump it up with something that you can see through.

And if we're taking a young person who needs to be able to drive and needs to be able to look after her child and work, the quality of vision you get with silicone oil is not great.

The really different thing about this approach is we're injecting the gel in the back of the eye.

And that had never really been done in a rigorous way.

And that was sort of the eureka moment that really changed everything.

Sophie Hutchinson.