Set Appliance State:

Gas On; Pilot On
Isolate Mains Power to appliance as per TOPs P4
Ignite and establish Pilot

Observation:

Extinguish the pilot by turning the gas control knob approximately 30 degrees clockwise.
After the initial sound of the gas valve closing, within approximately 30 seconds a click should be heard from the gas valve signifying the flame failure device within the gas valve has operated.