Picasso - Cruise Control

Hi,
I have a Citroen Picasso (Exclusive) - 6 months old on hire at the moment while my car is in for body work after someone reversed into me.
Now, I just cannot work out the cruise control. Generally, one gets to the
desired speed, turns Cruise on and presses SET for a second and then can remove foot from accelerator.
In the Picasso I turn cruise on and get "CC--- / OFF" coming up on the dash. When i press SET on the stalk, the "---" flashes for a few seconds and nothing more happens.
Am I doing something wrong?
TIA Ol
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Press the buttons on the back of the stalk to engage or to change speed (the same as the volume buttons on the opposite stalk)

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