BBC Four HD Saturday

Will Millard explores some of Wales's forgotten historic buildings, meeting the individuals trying to save these vulnerable structures before it is too late

Liz Bonnin marks the 50th anniversary of the construction of the Severn Bridge in a Timeshift special telling the inside story of its design and construction

The murder of a nurse opens old wounds in a small-town community, reuniting two former lovers tasked with finding the killer. Crime drama, starring Elen Rhys

A thrilling chase ends with an arrest and the team celebrate a great result but Ffion clashes with her sister when evidence emerges that links her to the crime

In a programme first shown in 1995, the chat show host reflects on a 1974 interview with actor Richard Burton, who was as famous for his off-screen romances as his on-screen roles

Documentary exploring the career of entertainer Harry Secombe and the challenges he faced, including the brutality of war and a life-threatening illness. Presented by Aled Jones

Fletch becomes convinced a conman he used to know is up to his old tricks. Guest starring Nigel Hawthorne

Harold is desperate to get some privacy from Albert and decides to take drastic action by dividing the house down the middle

Actor Harry H Corbett talks to Clive Goodwin about his start in the profession, the parts that brought him success and his views on acting. First broadcast on 18 February 1967

Will Millard explores some of Wales's forgotten historic buildings, meeting the individuals trying to save these vulnerable structures before it is too late

Liz Bonnin marks the 50th anniversary of the construction of the Severn Bridge in a Timeshift special telling the inside story of its design and construction