Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Turn Hot Water Tap On
Boiler Switch in ON position
Central Heating switch in OFF (central) position
Turn gas control knob to main gas position
Slacken water pump manual restart nut, take care to ensure any water released is safely contained
Gas On; Pilot On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

After approximately 6 seconds from main burner ignition verify that the pump is running.
Note:
Do not take noise or vibration as an indication that the pump is running.