As Keith Tunstall says, it was a couple of months after the visit of Khruschev and Bulganin to Oxford that the text of Khruschev’s speech denouncing Stalin was published in The Observer. However, the general contents and nature of the speech were known in the West well before the time of the visit. When the Soviet leaders were driven along Broad Street some of those watching started chanting ‘Poor Old Joe, Poor Old Joe (in unison, and the chant was quickly taken up by a large part of the crowd, perhaps most of it). The visitors, who presumably had no idea what was being chanted, looked delighted. If my memory isn't at fault, at least one of them waved his clasped hands above his head vigorously in acknowledgement.