Are relations between Sunni and Shia Muslims in the UK being strained by tensions abroad?
Could York learn from its Dutch counterpart about flood protection?
Are people damaged by vaccines being short-changed by the government?
File on 4 investigates the collapse of one of the NHS's biggest healthcare contracts.
Have the tennis authorities done enough to investigate allegations of match-fixing?
Allan Urry investigates claims of dirty tricks in one of Britain's biggest police forces.
British people smugglers: inside the trade in bringing illegal immigrants into the UK.
How safe are we in the hands of the growing number of agency staff at NHS hospitals?
The UK is giving a billion pounds of aid to Syrian refugees. But is it being well spent?
A lasting legacy? Have the sexual abuse revelations blighted Rotherham in the longer-term?
With millions of new apprenticeships promised, how will cash-strapped FE colleges deliver?
The role of British companies in a billion-dollar Moldovan bank scam.
Allan Urry investigates why the NHS is running short of some life-saving medicines.
Simon Cox meets migrants working in Britain illegally.
Under fire over controversial decisions, is the Crown Prosecution Service up to the job?
Jane Deith investigates conditions for tea workers in Assam.
Good cop? Bad cop? Reforming the police complaints process. Presented by Claire Savage.
Why is Network Rail struggling with its multibillion-pound plan to upgrade our railways?
Are taxpayers getting value from Britain's £12 billion foreign aid budget?
Destination UK: Uncovering the back door route for migrants trying to get into the UK.
Does a leading stroke drug cause more harm than good?
How can we build more houses and still protect our countryside? Allan Urry investigates.
Abandoned to their fate - are teenagers being pushed out of the care system too quickly?
Are vulnerable patients dying after being discharged from mental health care too soon?
Why, ten years on, does one of the biggest murder cases in Scotland remain unsolved?
How sexual abusers are increasingly targeting people with learning difficulties.
After terrorist shootings in Europe, how vulnerable is the UK to a similar attack?
Why are so many teachers off work with stress? Jane Deith investigates.
Have UK taxpayers been paying over the odds to prop up council pension funds?
Fran Abrams reports on the shortage of secure places for children at risk.