File on 4 Investigates how Immigration Enforcement officers are tackling sham marriages. Claire Jones follows Home Office officials as they apprehend people entering into, and organising fake marriages in order to circumvent the UK’s immigration laws. She discovers details of criminal gangs charging people up to £30,000 for a partner and 'marriage pack', a set of photos and documents designed to create a convincing back story of the fake relationship. After File on 4 Investigates asked the Home Office why more statistics are not available on suspected fake marriages, they have now committed to regularly publishing these numbers 'in due course'.

Presenter: Claire Jones

The Church of England is confronting difficult questions over a £100 million fund to address its historic links to slavery. Aleem Maqbool hears from clergy, historians and politicians as he explores the arguments over reparations, responsibility and whether the Church can make amends for sins of the past.

Presenter: Aleem Maqbool

Liv Nervo is one of the world’s most successful female DJs, who along with her twin sister, make up NERVO. She was starting a family with a man she believed was the love of her life - but at six months pregnant, she discovered he had been living a double life. She says she entered the relationship under false pretences and wouldn't have consented to sex had she known the truth about his other relationship.

What happened to her reveals an intense debate about consent, the law and a lesser-known form of domestic abuse called reproductive coercion.

G for guidance - this programme contains strong language.

Presenter: Alys Harte

Hair Strand Tests can show if parents have been using drink or drugs. Such tests play can a central part in Family Court hearings every year as judges decide whether children should go into care or not. Some barristers have been raising the alarm over the way the tests are presented and interpreted in the Famly Court. And, for the first time, File on 4 Investigates talks to mothers who nearly lost their babies – thanks to hair strand tests.

Presenter: Sanchia Berg

Image: Lead Senior Scientist Dr Ellie Menzies carrying out a hair strand test

As the government plans major reform of the England's Special Educational Needs system, File on 4 Investigates goes back to the floor, spending time with councils as funding decisions are made and with families trying to navigate a system in flux.

From home-schoolers in Whitley Bay to getting on board a school bus in Hackney, we'll hear about the challenges of delivering services to tens of thousands of children with SEN each year. As the number of young people who need extra support rises how will Councils balance their books?

Over a hundred schools have closed in England in the last five years. Analysis by the BBC’s Data team has shown that pupils with special educational needs have been disproportionately affected by school closures. These pupils made up 29% of those whose school has closed, which is higher than the national average.

We'll hear how the disruption of a school closing can affect those with additional needs, and their families.

Presenter: Hayley Clarke

(Thanks also to the BBC News Data Journalism team)

Police have dealt with scores of cases involving home-made 3D printed guns in the UK in the last three years. Data obtained by File on 4 Investigates from the National Crime Agency shows that criminals and extremists have attempted to manufacture the weapons.

We hear from police who successfully prosecuted a group who had manufactured printed firearms to sell on to criminal gangs. As Adrian Goldberg asks, how much of a threat are these printed weapons in the UK and what can be done to deter people from making them?

Producer: Paul Grant

Finance professionals who paid thousands for training courses in Dubai seemingly endorsed by a government official say they were duped by the British businessman behind them. Participants in the 12-week “accelerator” programmes say they provided little in the way of useful training, while the millions in potential investment offers promised to graduates never materialised.

File on 4 Investigates a trail of deception left by the British “finfluencer” behind the course.

Presenter: Yemisi Adegoke

DNA detectives track down the British soldiers who fathered children in Kenya then disappeared, leaving the children and their mothers without support.

With exclusive access to every stage of this cutting-edge process, we follow as a team of lawyers and a leading geneticist travel to Kenya. We witness the groundbreaking legal and scientific detective work used to find the missing military dads.

Lawyers believe British soldiers stationed at the army base in Nanyuki, Kenya, may have fathered hundreds of children over decades — the oldest we meet is now 70 the youngest just three years old.

What’s at stake is not only the reputation of the British armed forces and the UK’s post-colonial legacy. The mixed-heritage children have in some cases been ostracised by their communities and denied a chance of British citizenship since birth.

Presenter: Ivana Davidovic

A Long Form Audio production.

Jack Butcher investigates allegations that children in West German welfare institutions were subjected to widespread medical abuse, including medical experiments.

During the 1950s, 1960s and 1970s, many children found themselves in West Germany's sprawling network of children's institutions. In recent years, Germany has been shocked by revelations that some were used as guinea pigs for powerful new drugs, including potent anti-psychotics, as doctors worked hand in hand with pharmaceutical companies to observe the effects of new medications on young children.

The allegations were first brought to public attention by Sylvia Wagner, a pharmaceutical historian who grew up in a care home, and whose own brother was a victim of medical abuse.

Pulling together Sylvia's research, speaking to victims and digging through the documentation, Jack Butcher and reporter Ilona Toller, who led a major investigation of the scandal for German national radio, lay bare the horrendous human cost and tell the story of the tenacious activists who have challenged the conscience of their nation.

Producer and Presenter: Jack Butcher

White disadvantaged girls are being overlooked, school leaders are warning. Whilst white working-class boys remain one of the worst performing group in their GCSEs, white girls from low income homes aren’t much further behind them.

File on 4 Investigates has worked with the BBC Data team to compare 2025's GCSE results in England with those of 2019. The team found that white working class girls in England have seen some of the biggest declines in attainment since 2019 - with just 38 percent of these students passing their English and Maths exams. All girls are down by 1.6 percentage points at GCSE but low-income white British girls are down by 6.4 percentage points. Cutting the link between 'background and success' and halving the 'disadvantage gap' is something the Department for Education has pledged to tackle.

In this programme we examine what is behind the decline for this group of girls and meet school leaders who are working to reverse it.

Reporter: Hayley Mortimer