The campaign was called The Thing You Didn't Want To Do.
It was eleven films of about forty seconds each and not one of them had a single word of dialogue about love in it, and they were all a person doing something small and slightly annoying for somebody else while nobody watched: a man defrosting a car at six in the morning. A woman going back out for the specific yoghurt. Somebody driving forty minutes to a hospital car park and sitting in it. Somebody saying go on then about a dog.