SolaScriptura-
I'm not sure what books you have read that cites Stott, so may I suggest "Hell on Trial: The Case for Eternal Punishment", by Robert A. Peterson. He documents Stott's explicit statements in it. He does mention that Stott holds to it tentatively, and at a conference he spoke at and I attended he stressed Stott's tentativeness a couple times. If you want I can give you some quotes from the book if you do not have it or have not read it. The book from which Peterson cites Stott's statements is, "Evangelical Essentials: A Liberal-Evangelical Dialogue", by David L. Edwards and John Stott