Hi Tinsparrow,
You can't take the flight skills test for CPL issue until you pass either the CPL or ATPL theory exams and you cant sit these exams until you satisfy CAA etc that you have completed the required hours of study either in a classroom or by distance learning.
For either full time study or distance learning you have to enroll with an approved training establishment and they will verify that you have completed the necessary hours when you fill out your exam application forms. Regards
Willby
PS Just noticed after I posted that Cat. had already answered your query!