Set Appliance State:

Mains Power Off
CH Demand
Summer/Winter Switch set to Winter.
Heating Thermostat to MAX.
Only one radiator on.
Gas On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

With the boiler alight in CH mode - run for three mins, remove demand for heating.
Does pump continue to run?
Observe flow switch, is it still closed?
Pump continues to run and Switch is closed.