The 54 inch Black Knight.
Following Dazzle, a further set of re-entry experiments, Crusade, was planned, and as part of this, an enlarged Black Knight was designed. Using the extra thrust of the Gamma 301, it could be heavier, and so was designed with a 54 inch tank diameter rather than the 36 inches of the original vehicle. Both are shown above.
However, Crusade was cancelled in favour of Black Arrow (the Treasury would not fund both). The U.S. carried out a further series of trials, Sparta, using Redstone rockets, but with no U.K. contribution little information was shared.