Sky1 has released the first teaser for Critical, the channel’s new “ultra-realistic real-time medical drama” from Line of Duty creator Jed Mercurio. Starring Lennie James (The Walking Dead, Line of Duty), Catherine Walker (Strike Back), Claire Skinner (Outnumbered) and Kimberley Nixon (Fresh Meat), the 13-part series will tell “one story, in one place, in one … >