2000s Show/Movie about a couple in a camper van who kidnap 2 young siblings after losing their own
I saw this show/movie on British Terestrial televsion in the mid-late 2000s. The plot scentered around a family of 4 (Husband, wife, Daughter, Son) of which the 2 children are kidnapped by a different couple that are travelling around in a big campervan.
We come to learn that this couple lost their own kids in a drowning accident in a river, but from what I can remember it is later revealed via a flashback scene that the man was responsible for drowning his children in said river.
One prominent scene that sticks out is one where the brother/sister and their abductors are sat inside the campervan eating a meal. There is a cat under the table that the brother and sister keep feeding meat from their plates to which point the man loses his temper and proceeds to kill the cat in front of them.
I don't think that this film/show is Bon Voyage despite the glaring similarities in plot. Everthing I've searched about that movie and I can't find aany reference to the scene where the man drowns his own kids or the one where he kills the cat.