File on 4 Investigates

Valued at £80 billion, the UK's junior stock market is hyped as the most successful growth market in the world.

Government incentives - including stamp duty and inheritance tax breaks - mean that more ordinary UK investors are opting for the Alternative Investment Market (AIM).

Set up in 1995 to allow smaller companies to raise funds, AIM is a less-regulated alternative to its big brother, the main London Stock Exchange.

But it is no stranger to controversy.

Once labelled a "casino" by a senior US regulator due to its lax regulation, the market has been hit by a series of recent high profile scandals.

File on Four asks if this light-touch regulation poses a hidden risk for shareholders and if unscrupulous businesses are exploiting AIM to rip off ordinary British investors?

Producer: Alys Harte

For a long time, society didn't want to believe child sex abuse was happening - but now are sex crimes against elderly victims being dismissed in the same way?

File on 4 reveals new figures about the scale of alleged sex offences taking place in residential and nursing homes. Whether 5 or 85, should the victims of sexual assault be treated any differently?

Claire Savage hears from the families of elderly people, some with a form of dementia, who have been sexually abused by care workers or by other residents. We also speak to care workers about the challenges they face in dealing with intimacy and sex in care settings.

Experts claim elder sex crimes are being missed or going unreported because not everyone wants to admit these offences are happening. How good are those within the care industry at recognising the signs of elder sexual abuse and at coping with the moral and ethical dilemmas of establishing when a consensual relationship becomes potential abuse?

We speak to those who explain the complexities of bringing about prosecutions where the victim or perpetrator lacks mental capacity and asks if such cases are in the public interest to prosecute.

Reporter: Claire Savage

Five years after shocking revelations about the abuse of patients at Winterbourne View, File on 4 asks what progress has been made on the promise to get people with learning disabilities and autism out of hospital units and into homes in the community with good support.

Families of those still stuck in these units say patients are trapped in the system with no clear plan or apparent will to get them home. For those eventually discharged, almost as many others are admitted - parents say, because there aren't enough community support services.

But if people are let out by the institutions, what's does so-called 'supported living' in the community look like? File on 4 hears concerns about the quantity and quality of this promised care. Parents describe living on the brink of a crisis that could land their children back in a cycle of being sectioned and locked up.

NHS England says the plans are taking shape. But families say it's like living in The Twilight Zone, in a limbo hidden from mainstream view and unable to find a way out.

So just how successful is the landmark 'Homes not Hospitals' plan, that aims to improve life for some of the most vulnerable patients in the NHS?

Reporter: Jane Deith

Earlier this year, the government introduced legislation banning the production, distribution, sale and supply of legal highs. Designed to stop what has been described as a tsunami of chemicals flooding into the UK, it has resulted in the closure of the high street shops which had been selling exotically named substances like Spice, Mamba and China White.

So why are they still finding their way onto the streets? File on 4 traces the supply back to labs in China and discovers a myriad of psychoactive substances are still only a few internet clicks away. Prior to the ban, the authorities were aware of the risk that internet sales could take over from the high street and that China is fast becoming the 'chemical and pharmaceutical wholesaler to the world'.

So is the new legislation really the answer, and if not, what options remain to disrupt the now illegal supply of these lethal substances?

Reporter: Danny Vincent

Police are investigating allegations of abuse made by people who, as children, were sent for psychiatric treatment at Aston Hall Hospital in Derbyshire. Some patients say they were only sent there because they were difficult to manage or had behavioural problems.

The Medical Superintendent is accused of 'experimenting' on his child patients, giving them an anaesthetic called sodium amytal in therapy sessions throughout the 1960s and 1970s. Phil Kemp investigates the history of this treatment, which was used on shell shocked soldiers during World War Two, employed as a 'truth serum' by police and intelligence agencies, and by the 80's had become implicated in false memory cases. The hospital closed in 2004 and the Medical Superintendent died in 1976, leaving his patients struggling to make sense of what happened to them at Aston Hall.

Although treatment records reveal the sodium amytal was used on some children, former patients question what really went on while they were drugged. File on 4 opens the medical archives and hears from former staff to piece together a troubled chapter in the history of psychiatric care, and in the lives of former patients.

Reporter - Phil Kemp

Is the UK putting trade above concerns about human rights in the United Arab Emirates?

Britons who claim they were tortured in the Gulf state's prison cells say the UK government failed to fight for them.

The foreign office has received 43 cases of alleged abuse of UK citizens in the UAE since 2010.

In exclusive interviews, File on 4 hears from those who've got out of detention in Dubai who say they were arrested without charge and subjected to violent treatment and torture.

The UK government says it regularly raises Britons' cases - and allegations of mistreatment - with the UAE authorities. But those who've been stuck there tell File on 4 they didn't get the support they needed and expected when they were suffering, despite the authorities here knowing the risks they faced.

The government's also promoting deals with its largest trading partner in the Middle East.

Jane Deith counts up the billions of UAE investment in the UK, from container ports to housing developments.

And the programme hears the arguments for joint ventures with Emirati companies - for example by NHS hospitals - as a lucrative way to generate income as budgets are squeezed, ultimately providing better services for patients here.

The United Arab Emirates is seen as a stable ally in an unstable Middle East, not least in the fight against Islamic State - does that make the UK less willing to raise issues like human rights abuses and judicial process?

Reporter: Jane Deith

Successive government procurement strategies have repeatedly promised high quality public buildings made possible through Private Finance Initiatives, but is that what's been delivered? What went wrong in Edinburgh where 17 schools remained closed after the Easter break because of fears walls might collapse on children and staff? Allan Urry reveals new concerns about the extent of fire safety problems in some schools and hospitals because contractors failed to ensure they were built to specification. How safe are they, and who's footing the bill to put them right?

Producer: Ian Muir Cochrane

Around 2.5m council tenants across the UK have bought their homes since Right to Buy started in 1980. The scheme is now being extended to more than a million housing association tenants in England with the first homes expected to be sold in pilot areas next month.

Simon Cox goes on the trail of the fraudsters and the companies seeking to make big bucks out of right to buy. He discovers people trying to buy homes they're not entitled to and criminals attempting to launder drugs money.

He investigates companies who offer tenants help to buy their home in order to get their hands on valuable properties.

He also hears concerns from experts that many housing associations do not have the resources and skills to prevent fraud which could potentially result in the loss of millions of pounds worth of much needed homes

Reporter: Simon Cox

The recent deaths of children at the hands of family members have revealed some children's social work departments are still failing children some nine years after the death of Baby P. In some regions the reaction of the Government has been to take social workers out of the hands of councils and put them into independent trusts.

So what's been going wrong - and will the radical solution coming out of Whitehall really work? Jenny Chryss investigates.

Producer: Rob Cave.

Over the past five years thousands of patients in England have been given access to new but expensive cancer drugs through a special Cancer Drugs Fund. But critics argue that hundreds of millions have been spent on drugs that offered poor value for money with sometimes limited effects. The Fund is now being reformed but cancer charities have written to the Prime Minister to express deep concern that drugs will now struggle to gain approval. Phil Kemp investigates the record of the Cancer Drugs Fund and asks if the proposed changes will offer better value for money or access for patients.

Reporter: Phil Kemp