The Panopticon/Capitalisation

From Tardis Wiki, the free Doctor Who reference

I was wondering, was there any debate over whether terms "First Doctor", "Second Doctor", etc., should be capitalized. The terms are never used on-screen and rarely in-story, and when I have seen them, it's with a lower case (though I can't say I have read all the books). If this has been debated, sorry for the question. Is there a link to such?