Have just found the following on the Peugeot Website solooks like my earlier post was wrong
PEUGEOT CONNECT 3D MEDIA NAVIGATION (NG4) Address book and voice command integration
The above guide was written for software version ng4_D_R26b_R26.04
Voice commands
The voice command function is activated by pressing the ""˜Push to talk' (PTT) button
which is located on the end of the indicator stalk (the left hand stalk above the
cruise control stalk if present). Once pressed, a double bleep tone will sound which
means that the microphones are now on and ready for speech recognition.
Below is a list of voice commands that are useful to know (press PTT and wait for
the acknowledgement beep before speaking):