Spils,
Do remember that you can't take the ATPL course and then just turn up and sit the CPL exams.
If you want to do an ATPL course and then do CPL exams, you will have to obtain permission from the CAA; and you will need to have a good reason. Most ATPL schools are not certified to do the CPL.
I did the ATPL course (because I wanted to study full time) and am doing CPL exams (with CAA permission), but this has posed a problem because when I came to revise, it proved very difficult to separate the ATPL things in my manuals that I don't need to revise for CPL from the things I do need.
If you are going to do CPL by distance study, I suggest you take any opportunity you can to examine the study material produced by different teaching establishments. One thing you will notice is that most if not all of them produce manuals with no subject index at the back. This can be an absolute pain when you come to do feedback papers and need to check back on the answers you got wrong.
Best regards,
Broomstick