Energie,
Anyone can write the JAA ATPL exams and in most cases, the ATPL exams are used in lieu of the CPL exams in Europe - I guess it's to avoid having to do them when you hit 1500 hrs for upgrade.
I'd use Bristol - I did mine with them and found the distance learning to be great - get the exam question database access.... I found it to be the biggest help to pass them... wasn't easy!