H.P.80 Victor Patrol Missile Bomber Phase I
While Britain was working on developing the Blue Steel ALBM, in America other ALBM missiles were also being developed. The British government decided to adopt the Skybolt, while still in development, for the V-bomber force as individual aircraft could carry multiple weapons.
HP proposed two designs; a significantly modified aircraft able to carry 4 Skybolts, and a relatively simpler modification to carry 2 Skybolts. The 4 Skybolt variant was designated as the Victor Phase 6, while there is no (currently known) Victor Phase 5. However the modification to Patrol Missile Bomber notes the 2 Skybolt aircraft as the Patrol Missile Bomber Phase I, with the 4 Skybolt aircraft as Patrol Missile Bomber Phase II - so perhaps the Victor Phase 5 was the 2 Skybolt aircraft?
HP's proposal for the Skybolt was for initial aircraft to be modified by the addition of wingtip fuel tanks and mounts for Skybolts at the standard fuel slipper tank mountings. HP envisioned the modification being conducted in the field at RAF stations with supplied kits.
H.P.114 Victor Phase 6
The more significant upgrade would require more extensive work to be completed back at the factory, with the aircraft allocated the H.P.114 designation. Further additional fuel tankage was to be included with the complete replacement of the bomb bay with a conformal tank fitting, and the addition of pylons to mount the extra Skybolts. The increased weights would require a strengthened 12-tyre undercarriage.
The ground clearance of the Skybolt under the Victor was a concern, and it appears that the RAF never seriously considered the Victor as a Skybolt platform. The Vulcan was eventually used for testing of the Skybolt, but the project never came to fruition, as in December 1962 the US cancelled the Skybolt.