Great interview! I loved Bedknobs and Broomsticks, too! Did you ever see the movie? I still know the words to the song that animates everything in the house. Sometimes I sing it at my place just to see if it'll work! :)
I heard the movie was terrible, and I've never seen it...the book I used to own when I was six or seven had the front cover as a picture of the kids from the film sitting on the bed!