This movie was based upon Pascal Bruckner's 1981 novel "Lunes de fiel" - a pun on "Lune de miel", the French word for "honeymoon". "Lunes de fiel" literally means "bile moons".
Hugh Grant and Dame Kristin Scott Thomas appeared in Quatro Casamentos e um Funeral (1994), in which Thomas also played a character named "Fiona".