During the war, my mother used to take me to the local repertory theatre on a Monday night, and we used to get two seats for the price of one, for nine pence, in the gods.
I feel I could be walking down the street, and if somebody talked to me, I could just slot into 'Miss Marple' and know how she would react.
Quite honestly, I think that if you are making a lot of television programs with a central character, then ultimately it can become boring if you know nothing about them. I personally want to know, or get to know, things about a character. It doesn't mean to say that they still can't have a certain mystery about them.