Dr. Alister Chapman who has studied John Stott for the last 10 years, has published a book on Dr. John Stott:
Godly Ambition: John Stott and the Evangelical by Alister Chapman
Dr. Alister Chapman mentions briefly Stott’s position on hell on pg 145 of his book
“Stott also raised questions about whether hell would in fact involve the eternal, conscious torment of the lost – a staple of conservative evangelical preaching. Stott had struggled with this issue for some time. As a pastor he evaded the question, telling his congregation that he did not want to “be drawn into controversy about the exact nature of hell.” Now, however, he was as much a theologian as a pastor, and it was a theologian’s job to raise awkward questions, to stake out his ground, and take flack if necessary. Stott came in for heavy criticism after he published his view on the subject, and he lost credibility among American evangelicals in particular. He defended himself by saying that the true marks of an evangelical were a commitment to study the Bible and to submit to its authority not the tyranny of doctrinal traditions. However the criticism hurt him deeply, especially when it came from the mouth of that other tower of post-war Anglican evangelicalism, Jim Packer. Stott’s willingness to be candid about his questions about the nature of hell damaged his credentials as a evangelical stalwart. This made life harder for him with the theological conservative end of Lausanne. Yet the reality was that by the 1980s Stott was a different type of Christian from the one who first became preaching to students in the 1950s.”
Here is an interview with Dr. Alister Chapman. He does not mention Stott’s position on hell in the interview.
Devotional Thoughts from 
You might like to vote in this poll about hell ( follow the links) 

