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There is a further problem with the code fix.
My ex-admin, who was granted Admin rights only to assist with maintenance of our FAQs, has now had their admin rights removed, however they are still able to see and successfully use the Administration Menu option, and also the FAQ module only in an Administrator capacity.
Seems the action to remove them from the Admin group has functioned correctly, however the actual user permissions remain, and they're now a 'registered user' with FAQ Admin capabilities.