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that's all taken into consideration "Smithy" but the problem is the main burner is not firing up. OK, the pilot is staying lit that eliminates the millivolt generator which you have pictured. next is to check you are getting 24 volts to the main gas valve which you also have pictured with the yellow and red wires. use a multimeter set for 200 volts and measure the voltage at those terminals when the unit is calling for heat. if you have 24 volts but the solenoid didn't open then replace the gas valve solenoids or the whole valve. shut the gas off before you disconnect any piping.
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