The ZS is the family mile eater and one thing I've always missed is cruise control.
Strolling around my local scrap yard I came across an early 2.0 KV6 auto Rover 45 which had audio and cruise switches on the steering wheel.
The wheel is now in my car and the audio controls are wired up.
I also found the dash control switch, one of the control ECU's (there are 2), the actuator and actuator pump.
It appears that most KV6's have the mounting bracket for the acuator attached to the throttle body.
The next time you are under the bonnet have a look.