I think Paco is referring to the written CPL exams rather than the practical CPL course. You no longer need to do these through a training organisation if all you wish to do is use them to become a flying instructor. You can self-study them and sit the exams, HOWEVER no matter how well you do, you wouldn't be able to use those passes to go on a CPL practical flying course, they would only ever be able to get you on the FI course. To go on a CPL flying course requires that the exact same written exams were done through a training organisation with an element of compulsory ground school. Obviously by "written" I mean "sat at a computer"!!