WARNING: Embargoed for publication until 00:00:01 on 13/06/2017 - Programme Name: Doctor Who S10 - TX: 17/06/2017 - Episode: The Eaters of Light (No. 10) - Picture Shows: ***EMBARGOED UNTIL 00:01hrs 13th JUNE2017*** Lucius (BRIAN VERNEL) - (C) BBC/BBC Worldwide - Photographer: Simon Ridgway