Interesting speculation by author Grand Hudson as at whether there might be a tie between the TARDIS and C. S. Lewis.
Lewis, the Wardrobe and the Police Box
If, like me, you tend to read a great deal of significance into things, it won’t have escaped your notice that C. S. Lewis died about an hour before John F. Kennedy, the U.S President. I wonder, though, if you will have noticed that he also died the day before Doctor Who was first broadcast.
Lewis, who had invented a wardrobe which contained or led to an entirely different world (and, in the final story of The Chronicles of Narnia, The Last Battle, a stable which was similarly bigger inside than out) didn’t live to see the first companions of the Doctor, Ian Chesterton and Barbara Wright, stumble into the TARDIS, the now famous blue Police Box which was not only bigger inside than out but which also was capable of transporting its occupants anywhere in time and space. I don’t know if Sidney Newman, the originator of the idea of Doctor Who, or the set designers of the time, had read The Lion, the Witch and the Wardrobe or even The Last Battle -it’s quite possible that they had, considering that they had been published several years before and were best-sellers— but however it happened, the concept of an ordinary object that was a doorway to different realities lived on in the television show, parallelling the popularity of the wardrobe in Lewis’s work.