Emma Caldwell was a young woman from a good home who developed an addiction to heroin after the death of her sister and then descended into street prostitution. When her body was found dumped in a ditch in Lanarkshire in May 2005, the police launched an unprecedented murder hunt. But ten years on, after an investigation costing millions of pounds, no one has ever been convicted of her killing. Eamon O Connor investigates what went wrong.

It's taken a long time to break through the culture of denial, but child sexual exploitation cases from Rochdale to Oxford have shown that grooming of children can happen in any community.

There seems to be a growing acceptance that what the Deputy Children's Commissioner says is true: 'there isn't a town, village of hamlet in which children are not being sexually exploited'.

Councils that thought they were immune from groomers and traffickers, are now training staff to spot child sexual exploitation. And children are being taught how to avoid falling prey.

But, as children become more aware of grooming, are abusers increasingly turning their attention to people with learning disabilities?

In the first of a new series, File on 4 hears warnings from disability workers and detectives that abusers are increasingly targeting people with disabilities - because they're less likely to know what grooming is, less likely to tell, and if they do, their case is far less likely to go to court.

Jane Deith visits the only safe house in the UK for women with learning disabilities who've been victims of rape and sexual exploitation, and hears even this secret address is now on the radar of gangs trying to groom the residents.

Women with learning disabilities tell their stories of being groomed and exploited, how they eventually broke their silence, only to be told the crimes would not be prosecuted. Of an estimated 1400 cases of sexual abuse each year, only 1% result in a conviction.

If offenders aren't being punished, can we prevent the abuse by protecting those at risk? Councils worried someone is being exploited can go to the Court of Protection for permission to restrict their relationships on the grounds they don't have the mental capacity to consent to sex. But it's a difficult thing to rule on. File on 4 hears from disability workers who say men and women are being left open to rape and abuse, but also from campaigners who say the state is denying people their fundamental human right to sexual relationships.

Reporter: Jane Deith Producer: Sally Chesworth.

With Britain on heightened alert following Islamist shootings in Paris and Copenhagen, how well prepared are we to deal with a similar attack?

Allan Urry discovers how extremists in neighbouring European countries were able to get access to guns and hears concerns about the ready availability of illegal weapons from Eastern Europe and North Africa.

So what risk does that pose for the UK? Britain prides itself on tough gun control, but is that enough to prevent determined would-be terrorists getting access to firearms?

Reporter: Allan Urry Producer: Gail Champion.

Is the pressure on teachers reaching crisis point?

In Canada, everything is big - including powerful pension funds such as the Ontario Teachers fund which owns half of Birmingham airport and other large projects around the world. It's all a far cry from the British pension scene, where a hundred local government pension funds each run their own affairs separately and pay costly fees to City firms for investment advice.

Producer: Anna Meisel Reporter: Lesley Curwen.

Secure children's homes look after some of the country's most vulnerable youngsters. Largely run by local authorities, they provide safe accommodation for children placed on custody grounds or for welfare reasons because they present a danger to themselves or others. The demand for places is rising but the number of beds is falling. So where does that leave those they are meant to cater for? With the government currently conducting a review into the system, File on 4 gets rare access to one home in the Midlands to meet children and staff; and talks to those struggling to find places for children across the UK.

With a growing number of compensation claims arising from cases of historic sexual abuse and more recent high profile cases of sexual grooming, Tim Whewell investigates the key role which insurance companies play. In representing the local authorities where scandals occurred, insurers naturally seek to limit liability but are they doing so at a cost to victims? Lawyers say they have to battle to get access to files and other information - causing further distress and delaying help for those damaged by abuse. Some say the fight is getting harder as insurance companies have toughened their approach in recent years. And, with a national inquiry into historic cases of child sex abuse, how much influence did insurance companies have on the way some past investigations were carried out? File on 4 talks to senior local authority insiders who say they were told to alter their approach to abuse investigations to protect the insurers' interests. But was that at the expense of children at risk?

Satellite images reveal the extent to which sites of important historical interest have been looted in Syria. Some of these are in areas controlled by Islamic State where looters are believed to pay a tax to allow them to operate. Iraqi military say evidence from a senior IS member revealed the group is making millions of pounds from the trafficking of looted antiquities

Around 28 thousand people are claiming asylum in the UK. They're accommodated in some of the nation's most deprived areas while their cases are considered. Now, with numbers on the rise, some communities say they're struggling to cope. Allan Urry reports from the Northwest of England where, in some areas, there's concern about growing pressures on health services and schools. In Liverpool the City's Mayor, Joe Anderson, talks of an asylum "apartheid" and says other towns and cities need to take a fairer share. In Rochdale in Greater Manchester, there are more asylum seekers than the whole of the south east of England. The local MP Simon Danczuk says he's worried the pressures could undermine the good community relations that have always existed in the town.

Reporter: Allan Urry

Where have all the nurses gone? File on 4 looks at the reasons for the nursing shortage in the NHS in England and the cost of plugging the gaps at a time of peak demand.