Watch a clip from the final episode of ‘Parade’s End’ starring Benedict Cumberbatch and Roger Allam.

General Campion (Roger Allam) is sat at his desk explaining a moment order, but is confused why Levin (Elliot Levey) would choose for Christopher Tietjens (Benedict Cumberbatch) to share a train with McKechnie (Patrick Kennedy) and Perowne (Tom Mison), who all share a mutual loathing for Christopher.

‘Parade’s End’ airs on Friday 21 September at 9pm on BBC Two.