McLaren P1 Owner's Handbook Manual page 52

DRIVING CONTROLS
STARTING AND DRIVING
Sequential downshifts under braking can be
made by pulling and holding the downshift
paddle whilst braking. In this case the
downshifts will be called sequentially back to
the same engine RPM.
When the vehicle speed is below 10 kph
(6 mph) or the vehicle is stationary with a gear
selected, select a downshift and hold the
paddle to select neutral.
If under 10 kph (6 mph) you can also press the
neutral button on the tunnel to go into
neutral.
2.8