Mass Rapid Start
The mass rapid system was still operative in the '70s but rarely (never) used. The ripple procedure described above was much more reliable and employed whenever a scramble from RS05 on the ORP was called for. The engine start order was 2,3,1,4 and then you held your thumb on the Rudder PFC Start button and that started all the PFCs in sequence. The one button on that panel that was inop was "Gyro Hold Off" as that was a Blue Steel only feature.
Scramble demos at BofB displays were quite regular features in the 1960-70s. I recall doing at least two at Finningley.
YS