Thanks for the link mr pony.
It appears it's not just past or present Union members who can alert the Certification Officer of concerns about maladministration:
Originally Posted by The Certification Officer
WHO CAN COMPLAIN
2. A member of a trade union or employers' association may tell the Certification Officer
of circumstances suggesting one or more of the situations described above. However,
the Certification Officer can also receive approaches from any other source and will
consider these on their merits. In addition Certification Office staff will watch out for
references in the media to situations which suggest that the relevant set of
circumstances exist in the financial affairs of either a trade union or an employers'
association.