'Slow Horses' Season 6 review: Impeccable British espionage comedy

Apple TV's espionage comedy 'Slow Horses' returns for Season 6, opening with the death of David Cartwright and preparations for his funeral.

Jackson Lamb and his team of MI5 rejects discover that a series of killings is targeting former Slow Horses and that victims are being scrubbed from records.

Gary Oldman and Jack Lowden lead the cast, joined by returning actors including Olivia Cooke as Sid Baker and Hugo Weaving as Frank Harkness.