Flight Global (archives no longer available) say that during practice for the 1958 Farnborough display the Victor performed several rolls and loops. Nothing said about doing them during the actual display, though the article is titled "Farnborough Week: The most Memorable S.B.A.C. Display Yet", so it probably did. There is a video of a Vulcan doing a a half loop with a roll off the top.
Edit to add video of both Victor and Vulcan doing the LABS type delivery at the '58 show.