I'm not denying it's a Trade Union, all I'm saying is according to the Cert. Office website they have declined to be "listed", thus appearing on the "schedule" of Trade Unions. The fee for listing is £150.
So currently the PCCC is not a listed Trade Union with the Cert. Office, they are merely aware that it exists.
I am unable to ascertain what checks the Cert. Office makes to include a Trade Union in the "schedule", but I'll make sure to find out.