Panorama returns to the scene of the killing of 30 British tourists by a gunman on the beach at Sousse in June 2015. Reporter Jane Corbin investigates whether security concerns were ignored before the attack and if lives could have been saved on the day. She asks why there wasn't tighter security or a warning to holidaymakers to stay away from Tunisia after similar attacks. And should the Tunisian government, the British tour operators and the Foreign Office bear any responsibility for what happened?

On the eve of the new president's inauguration, Panorama investigates Donald Trump's strange bromance with Vladimir Putin. John Sweeney - who has confronted both men in the past - travels to Russia, the United States and the battlefields in Ukraine to report on what's behind their mutual admiration. He investigates whether Russian cyber-warriors helped get Donald Trump into the White House and asks how safe the world will be if they stay friends - or if the bromance falls apart.

The drugs that were known as legal highs have become a global phenomenon. They have exploded in popularity in the UK, and deaths from these chemical compounds, designed to mimic illegal drugs like cocaine and cannabis, have tripled here in recent years. In May 2016, the government acted by banning these drugs with the introduction of the Psychoactive Substances Act. The north east of England is one of the worst-hit areas for drug addiction. Panorama spent six months in Newcastle to see how the city is tackling the problem and asks whether the new law is working.

The police and social services were baffled when an elderly man with an American accent was found lost on the streets of Hereford. He didn't know who he was or have any ID, and he was dressed from head to toe in brand new clothes from Tesco. He was in a nursing home before Panorama took up his case. Reporter Darragh Macintyre follows the clues to America and unravels the mystery of the unknown man - before confronting the person responsible for bringing him to Britain.

One month after prime minister Theresa May promised to 'transform the way we deal with mental health problems right across society', reporter Sophie Hutchinson investigates the troubled state of NHS mental health services. She hears the concerns of staff and patients at the first mental health trust in England to be placed in special measures, and learns of the deteriorating national picture for mental health care funding, exclusively revealing new figures that show a shocking increase in unexpected deaths of mental health patients.

An undercover investigation reveals the reality of life behind bars in Britain's crisis-hit prison system. Footage recorded by a reporter also working as an officer at a Category C adult prison shows how inmates are effectively running the prison, with many of them off their heads on drugs and drink. It also reveals how prison officers don't feel able to maintain control and how they are at risk themselves. The programme also finds little evidence of rehabilitation or change, where some weak prisoners suffer, career criminals profit while jailed, drug addicts simply change which drugs they smoke, and the prisoners who could change their ways are being ignored. It comes as the government faces repeated warnings about the crisis inside Britain's prisons. There have been up to four riots in the last three and a half months, 354 deaths in prison last year and 6,430 assaults on staff in the year to September 2016.

What happens when a community is changed by immigration? Slough has gone from a majority white British town to a place where they are the minority. Ten years ago, Panorama's Richard Bilton reported on how Slough was struggling to cope with its migrant population. Now he's back. He finds a town with a booming economy and new families arriving every day. But there is a darker side. White British people are abandoning Slough, and some foreign workers say the dream is over.

Britain's kids are going to bed later and sleeping less, and hospital visits triggered by poor sleep have tripled in ten years. This is playing havoc with children's health and education and causing obesity, problems for parents and teachers, and even family breakdowns. In this film, reporter Jenny Kleeman finds that children's rocketing use of technology coupled with more lax modern parenting is creating an epidemic of poor sleep. Jenny visits a sleep charity in Doncaster that gets up to 200 emails a day from desperate parents. She meets Jayne, mum to a toddler who takes up to four hours to go to sleep, and follows them as they trial a firmer bedtime routine. At Honley High School in Yorkshire, Jenny investigates how poor sleep is affecting pupils' concentration and behaviour in class. Jenny also visits the sleep lab at Sheffield Children's Hospital, which has seen a tenfold increase in referrals in the last decade.

Three years ago Alexander Blackman, better known as Marine A, became the first serving British soldier to be convicted of murder since the Second World War for the killing of a badly injured Taliban insurgent on the battlefield. He has now had his murder conviction reduced to manslaughter. Panorama re-examines the case to find out what really happened on that fateful day, six years ago. Film-maker and anthropologist Chris Terrill has been following the case since the beginning, including meeting Blackman a number of times in prison. Chris has spent many years working with the Royal Marines and was embedded with Blackman's unit at the time the incident occurred in Afghanistan. He has tracked down some of the men who were with Blackman that day and they speak for the first time about the six-month tour that proceeded the killing and reveal disturbing new insights about the day itself. Questions are raised about whether there were other pressures on Blackman to act. Using material Chris shot in Afghanistan when embedded with Blackman's unit, the film provides a stark sense of what it was like to be stationed in a 'kill or be killed' outpost set in what was then described as 'the most dangerous square mile in the world'. The new evidence is presented for the first time and raises concerns about the way our soldiers fight wars and apply ethics on the battlefield. The outcome of the Marine A case could well shape the way we fight our wars in the future.

As hospitals struggle to cope with growing numbers of older patients, Panorama investigates the challenges facing those on the front line of a social care system buckling under the strain, and reveals a nationwide shortage of home-care workers. Filming in North Wales and Liverpool, reporter Sian Lloyd meets domiciliary care company owners struggling to recruit carers because they can't afford to pay them enough, whilst others are handing back council contracts because they can't make the numbers work. At the heart of this crisis are the people waiting for care - many of them in NHS beds, fit to go home, but unable to be discharged until a home-care package can be found.

Last week, the UK Parliament came under attack in the most serious terror incident in the country for over a decade. Speaking to witnesses and the injured, BBC Panorama pieces together what happened during the attack that left five people, including the attacker, dead and many more injured. The programme also looks into the life of Khalid Masood to ask what motivated him to carry out this fatal terror attack in the heart of London.

France votes for a new president in a few weeks, and far right candidate Marine Le Pen has her sights set on victory. She is trying to detoxify her party to distance herself from its racist and anti-Semitic past. However, Gabriel Gatehouse explores how the Front National's desperate need for money could be undermining this process. He meets fixers and insiders who have helped Marine Le Pen run her campaign and raise money from some controversial sources around the world.

How far should we go to force unemployed people back into work? Tens of thousands of families on benefits have had their payments cut as part of a radical government policy. Out-of-work benefits used to be assessed on need, but now payments in most of the country are capped at £20,000 a year. Panorama follows parents who have lost hundreds of pounds a month and are struggling to keep their homes - knowing that to escape the benefit cap they will have to find a job.

Following the acquittal of two former Barclay's traders, Panorama asks if the right people are being blamed for what has been called the biggest financial fix of all time. Piecing together explosive new evidence, which calls into question the safety of other convictions, Panorama reporter Andy Verity reveals that manipulation of the world's most important interest rate, Libor, was allowed and even ordered by people at the highest levels of the financial establishment.

In the murky world of British intelligence during the Northern Ireland conflict, one agent's life appears to have mattered more than others. Codenamed Stakeknife, Freddie Scappaticci rose through the ranks of the IRA to run their internal security unit. He was the IRA's chief spy catcher, in charge of rooting out those suspected of collaborating with the British. But all the time he was in fact working for the British intelligence services. Panorama reveals that a classified report links Scappatici to at least 18 murders. Some of these victims were themselves agents and informers. Scappaticci, the intelligence agencies who tasked him and the IRA to whom he also answered are the subject of a criminal enquiry. Panorama discloses how he kept his cover by having the blood of other agents on his hands, how the intelligence agencies appeared to tolerate this and why he has been protected for so long.

We're getting used to seeing a new Trump headline every day - or even several times a day. But we're all still clueless about what to expect next. A missile strike on Syria from an avowed America first president? As the unpredictable president approaches his milestone hundredth day in office, Jeremy Paxman crosses the US for a wry and searching examination of the whirlwind past three months. He'll attempt to make sense of the Trump agenda - and ask if it even makes sense to the man himself. Jeremy digs into the stories behind Trump's most controversial policies - visiting the home of North America's largest mosque to hear Arab-American experiences of the travel ban, and a north California migrant law centre that's working double-time. Amid the derelict factories of Detroit, he considers Trump's claims to be restoring America's economic fortunes. In Washington DC, Jeremy unpicks the phenomenon of fake news, and the consequences of Trump's self-declared 'war' on Washington itself. Grassroots critics and diehard cheerleaders tell us why they believe America will never be the same again. And senior figures from across the political divide - from Democrat deputy Senate leader Dick Durbin, Trump ally Ted Malloch, and former secretary of labour Robert Reich - share personal insights into Trump's White House and its new master. Jeremy asks what America - and the world - will look like after four years of Trump, and wonders if America's unlikely president might even have his sights set on four more.

Madeleine McCann is the world's most famous missing person. Her disappearance ten years ago has been investigated by police forces in two different countries, but they came up with contradictory conclusions. So what really happened to Madeleine in the Portuguese resort of Praia da Luz? Reporter Richard Bilton, who has covered the story for the BBC since the first days, examines the evidence and tracks down the men British police have questioned about the case.

Facebook is thought to know more about us than any other business in history, but what does the social network that Mark Zuckerberg built do with all of our personal information?

It has been called the worst treatment disaster in the history of the NHS. More than 2,000 people died and thousands more were infected with HIV and Hepatitis C after being treated with contaminated blood products. All the victims were infected over 25 years ago, but even now new cases are still being diagnosed. Survivors and their families are trying once more to persuade the government to hold a UK public inquiry. Panorama examines recently released documents, and asks if the government could have done more to save lives. The film hears the heartbreaking testimony of some of the victims and their families and explores the dilemmas of doctors who had to carry on treating their patients through the unfolding crisis.

Panorama goes undercover inside Britain's litter police and reveals some of the methods behind the soaring litter fines - over 140,000 were handed out in 2015-2016. The programme hears from people who have been stung with fines for offences like pouring coffee down the drain, dropping tiny pieces of orange peel and even leaving out their weekly rubbish. The undercover reporter goes inside one leading private enforcement company, with over 50 council contracts, to capture the litter police in action and reveals the bonus system used to reward enforcement officers for the number of tickets they issue.

One week on from the atrocity at the Manchester Arena, Tina Daheley reports on the attack targeted on the audience of thousands of young and teenage girls as they left a pop concert. She hears from concert attenders and parents, and investigates the community context and the extremist Islamist links behind the mass murder committed by the suspected suicide bomber, a 22-year-old man born of Libyan parents in the city.

In 1982 Argentina invaded the Falkland Islands, and a task force of over 100 vessels and 26,000 men and women sailed 8,000 miles from Britain to defend the islands. In a short but brutal war lasting three weeks, hundreds died on both sides, the Argentinians were defeated, and the islands were reclaimed. But what happened after the parades were finished and the flags were put away? In this moving film, Panorama uses animation drawn by a Falklands War veteran to explore how the trauma of fighting a war can continue to affect soldiers even decades later. The film follows a group of Welsh Guards whose lives were shaped by their Falklands experience as they return for the first time to the islands to confront their demons.

Theresa May's election gamble has resulted in a catastrophic outcome for the Conservatives, whilst Jeremy Corbyn has defied many expectations. Following the election that's changed the face of British politics, Nick Robinson asks how and why it happened.

The fire that is believed to have started on the fourth floor of Grenfell Tower engulfed almost the entire 24-storey building at shocking speed. Firefighters battling the inferno say they have never seen anything like it before. Why were the fears of residents about fire safety apparently ignored and why did the flames rip so quickly through their council tower block? Richard Bilton investigates what happened that terrible night, as well as the grief and anger surrounding one of Britain's worst fire disasters in living memory, which occurred in one of its richest boroughs.

As one of Britain's largest youth groups, the cadet forces are responsible for nearly 130,000 children in more than 3,000 clubs across the country. However, not all members have positive memories of their time within the ranks. They are victims of sexual abuse by their cadet instructors, and this abuse could have been stopped but wasn't. This investigation shines a light on a culture of cover-up across the UK which allowed abuse to continue. Reporter Katie Razzall reveals the deeply troubling evidence with serious questions now facing the government organisation in overall charge - the Ministry of Defence.