I was well aware of the fact that once you appeared in Doctor Who as something else, you were ruled out for the part of the Doctor: that was a kind of well known thing in the business.
“Jewish persecution is a historical memory of the present generation and people fear it in the present day, and that's why those references are so much more powerful. I just understand that better now.”
“No memory is ever alone; it's at the end of a trail of memories, a dozen trails that each have their own associations.”