Yes, it was fun trying to keep the four 'Queens in synch on the Herons. They had one of those cockpit indicators with three rotating props, each showing its engine's RPM relative to the master engine - probably #1. When I went on VC10s two or three years later, I found they had the identical gauge. (Perhaps the Vanguard and Viscount had them too.)
It would be great to see and hear a Heron in the air again - not just on a pedestal outside Croydon Airport House.