‘Slow Horses’ Season 6 Trailer: Olivia Cooke’s Sid Makes a Surprise Return as Gary Oldman Warns Slough House Gang to Go on the Run

“Slow Horses” fans are in for a nail-biting ride in Season 6, with someone hunting down members of the Slough House crew – and the return of some familiar faces. A new trailer for the upcoming season, which launches Sept. 16 on Apple TV, sees Jackson Lamb’s band of merry misfits go underground as they…