In the early '50s, a young army officer and a student nurse fell in love. Four decades later, they meet again by accident. Just a wrinklies' reunion or will romance be rekindled?

Judi Dench is Jean, a hardworking widow who runs a secretarial agency with her beautiful, twice-divorced daughter, Judith (Moira Brooker). Geoffrey Palmer is Lionel, a divorced ex-army officer and coffee-planter, who has returned to write his autobiography entitled "My Life in Kenya". When Lionel becomes displeased with the temporary secretary from the agency, Judith tries to placate him and makes such a good impression that he invites her out to dinner.

Inevitably, Lionel and Jean meet, with the strangest feeling they have met before. As it turns out, they enjoyed a magical but brief affair before he was posted to Korea. His letter went astray, and she never saw him again, until now. Judith is a romantic and takes an immediate interest in their precarious relationship – but a few obstacles stand in the way. Alistair, Lionel's trendy young publisher, takes quite a fancy to Jean, and Lionel is not without his own admirers.

This series takes viewers into the thrilling world of M.I.5 – known to insiders simply as ‘Five’ – the clandestine security service, and the people who make up the elite team. They tackle organized crime, terrorist activities, embassy sieges, weapons proliferation and anarchists, not to mention the conflicts and power struggles back in the office.

MI5 is a topical and edgy drama about passion, jeopardy and the intrigue of people who have to lie for a living – and who have to deceive their loved ones about what they do.

In the post-9/11 world where the role of the Intelligence services and secret agents is being thrown into greater relief, this is a timely drama from a first-class creative team and boasts a very strong cast.

A motley crew of retired police officers re-opens troublesome cases that were never laid to rest. From the discovery of a new motive in the killing of a college lecturer, to the tracing of a missing child, the team finds a way through the detail that eluded the original officers. But they are finding a surprising incidence of cover-up and conspiracy in their new investigations. Are their superiors about to close ranks? Or is someone feeding them particular files? Either way, the suspicion that they are being manipulated is high – and the team is determined to get to the bottom of it. These old dogs won't roll over too easily.