Set Appliance State:

Gas Off
Isolate Mains Power to appliance as per TOPs P4
Turn Hot Water Tap On
Disconnect the ignition leads from the
spark generator and make safe
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Reset appliance as necessary and allow boiler to complete its self check.
Approximately 3 seconds after the boiler begins its ignition sequence,
can sparking now be heard from the spark generator?