""So something I took from Margot on 'Doctor Who' was to get the crew good food vans. Once a month, bring in a pizza van or an ice cream van. That's the lesson I learned from Margot. "The 'Masters of the Air' actor felt "revived" after he returned to London's National Theatre in ' The Importance of Being Earnest ' at the end of last year and into January in what was his first theatre role since 2018.He said: "It was so invigorating. I like a cup of tea and sitting in my house now."