No Blade of Grass

No Blade of Grass is a 1970 apocalyptic dystopian film directed and produced by Cornel Wilde and starring Nigel Davenport, Jean Wallace, and John Hamill. It was adapted by Sean Forestal and Wilde from John Christopher's novel The Death of Grass (1956) and follows the survivors of a plague that has hit London in the not-too-distant future. When London is overwhelmed by food riots caused by a global famine, a man tries to lead his family to safety to a remote valley in Westmorland.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.