Insight: Couples and families love to start shows together but rarely finish them with each other.

Proposition: No more cheating.

The new tech

Face recognition technology will lock episodes to encourage those that start a show with other people, to finish it with them.

This works on laptops, mobiles and, for television, across Remote Play on the Netflix app.

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Netflix will use its data to show how many people have been using the new face-lock.

Stunt

Exclusive screenings of new Black Mirror episodes will promote the new tech. Face scans will be used at the entrance so people can only enter with who they bought a ticket with.