How to watch Les Souvenirs in United Kingdom

Twenty-three years old Romain would like to be a writer, but, for the moment, he's night watchman in a hotel. His sixty-two years old father is retired and seems to not give a damn about anything. He shares an apartment with a twenty-four-year-old guy whose sole purpose in life is to seduce a woman, no matter who, and no matter the cost. His eighty-five years old grandmother is living in an old people's home, and she wonders what on earth she is doing with stuck with all these old people. One day, Romain's father turns up in a fluster. His grandmother has disappeared. In fact, she kind of escaped. Romain sets out to find her, somewhere in his memories.