bovingdonboy
You're right about the colour of the 2nd prototype Victor, it was blue.
Sadly the prototype HP.80 (Victor) WB771 crashed on 14th July 1954 during a low level calibration run over the runway at Cranfield when the tail ripped off and the aircraft crashed, killing the crew.
The second HP.80 Victor prototype WB775 had its tail fitted using four stronger bolts and flew on 11th September 1954, appearing at the Farnborough SBAC show during its first flight.
A week later it participated (flew past) at the 1954 Biggin Hill Battle of Britain display on Saturday 18th September when I took these two photos.