MG ZR Series Owner's Manual page 166

REAR LIGHTS (Van models only)
HB0666
166
Bulb Replacement
Take care to avoid any contact with a hot exhaust system,
when carrying out any maintenance at the rear of the car.
To access the rear light units, remove the moulded trim panel as
follows:
Using a cross-head screwdriver, remove the two screws (arrowed
in main illustration).
Remove the third fixing (shown in inset) by inserting a flat bladed
screwdriver into the slot on the fastener and levering the central
portion from its collar, so that it protrudes by 11 mm approx.