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Few football managers have had the impact on a nation the way Jack Charlton did. The Republic of Ireland was hungry for sporting success and while it was always going to be a stretch for the team to lift trophies, the fact that they could compete against the best internationally was a source of inspiration and national pride. Charlton's 10 year reign as Republic of Ireland manager was, of course, more than about sport. It was hugely symbolic for a country that for decades had shipped a lot of its brightest and best people overseas, as Gabriel Clarke and Pete Thomas' superb documentary feature 'Finding Jack Charlton' demonstrates. Born and raised in the coal mining town of Ashington, Northumberland, football was in Jack Charlton's blood. Jack and his younger brother Bobby's uncles Jack, George, Jim and Stan Millburn all lined out for clubs - counting Leeds United, Bradford City, Chesterfield, Leicester City and Rochdale among them. His mum's cousin, also call

Four series in and avid followers of ' Unforgotten ' know the formula off by heart by now. A body is discovered, with Nicola Walker's DCI Cassie Stuart and Sanjeev Bhaskar's DI Sunny Khan called to the scene. Forensics set about their business trying to determine how long the body may have been concealed. They are able to help pinpoint the exact date by focusing on a particular object. Stuart and Khan's team run with this line of enquiry and identify four or five shifty individuals who knew the victim. Those four or five suspects are evasive not just about their past but as other dodgy, current goings come to light. Eventually the conspiracy of silence crumbles and the killer or killers are revealed. That's how 'Unforgotten' has worked for three series. However during the fourth, writer Chris Lang and director Andy Wilson have decided to really shake up the formula. (SPOLIERS ALERT!) Series 3 concluded with cracks really beginning to show in the personal

There is a moment in the third series of 'Unforgotten' where you fear Chris Lang's cold case series might finally go off the rails. The police procedural, whose no frills approach has reaped dividends for ITV in the previous two series, loses a significant character in what appears to be a classic ratings grab. However in true 'Unforgotten' tradition, Lang's series doesn't lose the plot. Somehow it manages to keep its focus on its greatest strength - depicting diligent police work. The series begins with the discovery of the remains of a female by construction workers on a motorway. Nicola Walker's DCI Cassie Stuart and Sanjeev Bhaskar's DI Sunny Khan are quick on the scene and, before you know it, forensics have established they have the remains of a young woman who appears to have had a titanium surgical plate on her arm. Khan's enquiries establish the plate could date as far back as 1991 and it appears to have been foreign made in Greek Cyprus

There's a moment in the second series of 'Unforgotten' where TV's nicest detective duo actually fall out. Nicola Walker's DCI Cassie Stuart and Sanjeev Bhaskar's DI Sunny Khan are tested by the grim details of their latest cold case and tempers begin to fray over different attitudes to one aspect of the investigation. But this being 'Unforgotten,' their conflict doesn't last for very long, they soon patch it all up and they just get on with the work of establishing what really happened. Having notched up an impressive first series, Chris Lang's police procedural for ITV faces its difficult second series by doing what it does best. 'Broadchurch' started to falter during its second run, with some viewers struggling with its focus on a trial relating to the events from the first. The second season of Denmark's 'The Killing' also failed to match the potency of the original. Series two of 'Unforgotten' has the same narrativ