Ncuti Gatwa's joy at learning sign language for Doctor WhoTo play this video you need to enable JavaScript in your browser.This video can not be playedNcuti Gatwa's joy at learning sign language for Doctor WhoCloseWatch the full episode on BBC iPlayer.SubsectionCulturePublished3 MayShareclose panelShare pageCopy linkAbout sharingRelated topicsDoctor WhoFollow Doctor Whoclose panelYou are now following Doctor WhoUpdates from your News topics will appear in My News and in a collection on the News homepage.Read description