Express 100 combi boiler does not fire up?

4 Jan 2010
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United Kingdom
My Glow worm Express 100 combi boiler is nearly 20 years old. I have a problem where the main burner does not fire up when I request heating. The the pilot light is ok, the green running light comes on as I had set the thermostat at the required room temperature, and set the timer to ON. I cannot hear the pump turn or the fan start and I checked that it may be a flow switch. I just want to confirm that this is the case, or is there way avoid paying £85 for a new flow switch assembly(Platon).
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