LONDON — The Edinburgh Film Festival’s Michael Powell Award for best British feature film has gone to Andrew Haigh’s “45 Years,” which portrays a fractured relationship.

Haigh’s third feature centers on a middle-class couple, played by Charlotte Rampling and Tom Courtenay, questioning their relationship in the run-up to their wedding anniversary. The film premiered in competition at the Berlin Film Festival, where Rampling won best actress and Courtenay picked up best actor.

The Edinburgh jury, which was chaired by L.A. Times film critic Kenneth Turan, described it as “a quietly explosive film which represents classic filmmaking at its best. This is a measured yet provocative film, a masterclass in understated acting that was the unanimous choice of the jury.”

The award for best performance in a British feature film was shared by James Cosmo for his role in “The Pyramid Texts” and Rampling for “45 Years.”

Turan was joined on the jury by actor/director Karen Gillan and actor Ian Hart.

The award for international feature went to Marielle Heller’s “The Diary of a Teenage Girl.” The jury, which was made up of director Amy Berg, and actors Archie Panjabi and Natascha McElhone, described the film as “imaginative, both visually and narratively, emotionally gripping and completely unapologetic in tone.” Special mentions went to Kyle Patrick Alvarez’s “The Stanford Prison Experiment” and J. Davis’ “Manson Family Vacation.”

The documentary feature film award was picked up by Crystal Moselle for “The Wolfpack.”

The festival closes on Sunday with the world premiere of Scott Graham’s “Iona,” when the audience award, voted for by the public, will also be announced.