File on 4 Investigates Folgen

File on 4 reveals secret evidence of match fixing in tennis and investigates claims that sport's governing bodies have failed to act on repeated warnings about suspect players. The programme has seen confidential documents which reveal how some were linked to gambling syndicates in Russia and Italy which won hundreds of thousands of pounds betting on matches they played in. A number of those who have been repeatedly flagged on fixing lists passed to the game's Tennis Integrity Unit have continued to attract highly suspicious gambling activity. Reporter Simon Cox also has an exclusive interview with one of the most high profile players to be banned for match fixing who says the problem is widespread in the sport. Reporter Simon Cox Producer Paul Grant.

In the first of a new series, Allan Urry investigates claims by former officers from one of Britain's biggest police forces that they've been the victims of crimes committed by their own colleagues. He hears claims of dirty tricks by a secretive police unit within Greater Manchester Police which some officers say have led to criminal charges against them. Others say they've been unfairly targeted through the internal disciplinary process, with evidence distorted and statements changed. Are they bad cops with an axe to grind or victims of corrupt practices and institutional cover up?Producers: Sally Chesworth and Neil Morrow.

An inside job: the Britons smuggling illegal immigrants into the UK. File on 4 hears from Britons jailed for hiding people in their cars. They reveal why - and how - they did it. They were paid to smuggle people across the Channel by gangs based in London and the North West. This unofficial migrant taxi service - run from camps in Calais and Dunkirk - is believed to be netting criminal networks millions of pounds a year. But even that is dwarfed by the money to be made by British criminals bringing migrants over by the lorry load. Jane Deith reveals how the trade is spreading along the coast of Northern Europe, to Belgium and Holland. And she hears from Europol's Chief of Staff about the extent to which criminal networks based in Britain are involved in people smuggling. He tells the programme that more than 800 people have been identified as suspects. Reporter: Jane Deith Producer: Paul Grant.