The title is taken from a remark made by Prince Charles in an interview when he and Lady Diana Spencer got engaged: the interviewer asked, "Are you in love?" Lady Diana said, "Oh yes!" and Prince Charles added, "Whatever 'in love' means."
Director David Blair publicly disowned the movie and had his name removed from the credits after broadcasters ITV re-edited/re-cut the project without his approval.
Laurence Fox would later play King Charles III's maternal grandfather King George VI in W.E. (2011).
Hayley Atwell's debut.