In August 1966 HP tendered design studies for upgrades to both the Mk.1 and Mk.2 Victors to increase both capability and extend service life.
H.P.80 Victor K.1 retrofit
Both the K.1 and K.1A were to be modified to the same standard.
As the Mk.1 wing was not designed to carry the Mk.2 slipper tank, additional fuel capacity was to added with wingtip tanks similar to those originally posited for the Phase 6. The tiptanks would also significantly decrease wing stresses and increase the fatigue life of the Victor.
Additionally, as the engines could not be upgraded to higher powered models, the Mk.2 Kuchemann carrots were to be fitted - but modified to carry smaller jet engines as thrust augmenters.
H.P.80 Victor SR.2 retrofit
To increase the range or mission time of the SR.2, and to increase the aircraft's fatigue life, the same wingtip fuel tanks as for the K.1 were to be added.
H.P.80 Victor K.2 initial design
With the introduction of the K.1/K.1A tankers and with the B.2 and SR.2 still on active service a tanker conversion of the Victor Mk.2 was not an initial priority. Nevertheless HP provided a design for a K.2 three-point tanker.
The aircraft was to feature the Mk.2 slipper tank in a non-removable fitting and the wingtip tanks for additional fuel capacity. Again, the wingtip tanks would significantly improve the life of the wings by reducing wing fatigue. As committed tankers the nose glazing for the bombardier's position would also be blanked out.
However, after this point the British government's disasterous aviation policy destroyed Handley Page, and these three design advancements were not constructed.
The government had decided that there were too many independent aviation companies in Britain, and so embarked on a policy to force the amalgamation of the companies. This led to a point where RAF contracts would not be awarded to companies that were not "playing the game" and merging. The Hawker Siddeley group purchased Avro, so that the Avro 748 became the HS 748, and De Havilland, with the DH125 Jet Dragon becoming the HS 125, and made overtures towards also purchasing Handley Page. The price offered though was considered to be well below value, and so negotiations faltered. Without military contracts, civilian income was not sufficient to keep the company afloat, and in early 1970 HP went in to voluntary liquidation.