ok.,
Are you sure the gas is getting there? ( seeing as it was sparking ok before)
Does the boiler have igniting rules? ( like pressing in the 'dial 'as you depress the ignition button etc)
If the gas is there but you're not getting a spark, then it must be elec prob.
The power has to be turned on ( set for on) before the ignition will spark.
If the power is on, and the gas is there,
and you're following the ingnition procedure,
then, suspect a corroded electrode.or a damaged/broken lead.( yes I had a damaged spark lead- years ago)
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