Hmmm,
Does anyone out there have an Atom (blue) ignition module as these seem to work.
By pure chance my mower repairs friend showed me one on a customers mower today.
They have colour coded different modules for various applications and upon speaking with them there are good reasons why. But alas they don't make them anymore.
Perhaps some old stock out there somewhere...or else its back to re-keywaying my flywheel which is the alternative that Atom claim thier module can avoid.