Took a look at it yesterday and discovered it has no spark. I have tried a spark plug from a working mower and cleaned the magnet surfaces on the flywheel and ignition module to no avail.
Have run a multimeter and got a reading of 6.2 k-olms resistance reading from end of plug lead to both electrodes on the module. Ran it on a spare I found and got 5.95 on both it's electrodes.
Does that leave the chip as the culprit?

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Ahh, if only victa had kept producing the thumblatch catcher series, they would be in better shape today!