WARNING: Embargoed for publication until 00:00:01 on 16/05/2017 - Programme Name: Doctor Who S10 - TX: 20/05/2017 - Episode: Extremis (No. 6) - Picture Shows: ***EMBARGOED UNTIL 00:01hrs 16th MAY 2017*** Bill (PEARL MACKIE), Nardole (MATT LUCAS) - (C) BBC/BBC Worldwide - Photographer: Simon Ridgway