Police officers have made unannounced visits to two clinics run by Britain's most successful test-tube baby doctor.

John Sweeney investigates a real-life spy thriller that would baffle James Bond, when ex-KGB spy and Russian dissident Alexander Litvinenko was poisoned and killed by radioactive Polonium 210 in November 2006.

Secret emails reveal that the UK's biggest drug company distorted trial results of an anti-depressant, covering up a link with suicide in teenagers.

A Home Office minister has suggested people "distract" potential criminals while waiting for police to arrive and intervene. Tony McNulty MP agreed that jumping up and down could help.

Older people were put at risk in two substandard nursing homes, according to the regulator for homes in England. A whistleblower describes the "mental torture" of residents by staff to Panorama.

The armed forces minister has said the government should have acted sooner to deal with the backlog of inquests for soldiers killed in Iraq.

Violence and abuse against staff costs the NHS more than £100m a year in extra security, absenteeism, training of staff and legal bills.

We are told climate change is the biggest threat facing the world but is there anything the average family can do about it? The Rowlatts "went green" for an entire year.

The UK is 15 years behind the US in preventing attacks and murders by stalkers, BBC's Panorama is told.

Panorama reveals that British soldiers suspected of torturing Iraqi civilian detainees were not brought to justice.

AWOL soldiers tell BBC Panorama the army fails to help them cope with the traumas of serving in Iraq.

Safety checks at a hotel bungalow where two children died were not made by a gas expert, BBC Panorama learns.

Panorama investigates the reality of life behind bars in one of the UK's increasing number of private prisons.

GMTV suspends phone-ins after a BBC investigation finds callers have been defrauded out of millions of pounds.

The show looks at the murder of Bob Woolmer which happened at this year's cricket world cup.

Since the transmission of this programme, Jamaican police have attributed the death of Bob Woolmer to natural causes.

The series looks at St Mary's hospital in Manchester and Barnet hospital in London. The show looks at the staff working in the maternity wards and the difficulties they face each day.

The show looks at several communities which have been split by colour and religion.

The show looks at the Church of Scientology which was founded in America.

This week the show looks at the hidden health costs in the communications market in the United Kingdom.

Britain's biggest terrorism trial has just ended with the conviction of men who conspired to build a massive homemade bomb. But with the lifting of reporting restrictions, Panorama reveals the truth about what MI5 really knew about the July 2005 London bombers.

The internet is without question one of the greatest inventions of our time. For the majority of users it's a great source of information - the good by far out-weighing the bad.

But the bad is becoming more and more of a concern.

When we first came across the hundreds of violent videos that had been uploaded to various websites, we were shocked by the senseless and excessive violence, the age of those involved and the lack of sympathy from those watching and those who used their mobile phones to film the incident and egg-on the attacker/s.

No matter how many videos I witnessed during our research I was shocked and flinched, and still do, at the impact of the blows that rained down on the victims. Be it by foot or fist or weapon.

Meeting and speaking to victims and their parents, like "Joe", from Glasgow in Scotland, who had no idea the assault on their son was on the internet for others' entertainment made our investigation all the more important.

Panorama talks to Shiraz Maher, a former member of the Muslim extremist group Hizb ut-Tahrir which campaigns for an Islamic state.

Panorama follows a unit of the Queens Company of the Grenadier Guards for six months in Afghanistan