"It was a deliberate decision. I’m a restless soul, I suppose. I never like to stay too long in one thing and just wanted to get out. […] Poor Bill was horrified, he couldn’t understand what I was doing and why I wanted to go. I said ‘Well Bill, it’s part of my nature’ I’m a butterfly if you like; I like to do a bit of film and a bit of theatre…I don’t like it when I suddenly sort of find myself in a nine to five job that’s going on and on, and that’s what happened with Doctor Who."
Jacqueline Hill’s character Barbara left the series at the same time. “That was entirely a coincidence. I said that I would leave and I think Jackie wanted to spend more time at home and she wanted to have children. She started thinking about it and decided it would be a rather good idea if we went at the same time. […] When I knew that Jackie was going I said, ‘Why don’t we do a play together?’ We did a tour of ‘Separate Tables’. We started in Leeds and it was great fun. Inevitably the posters declared ‘featuring the stars of television’s Doctor Who’
- William Russell on leaving Doctor Who (DWM, 1995), and the poster for Separate Tables: