Try their website, it has most of the information you could need....as does this thread:
http://www.pprune.org/interviews-job...-part-2-a.html
Time from initial application takes between a few days (2-3 days) and 2 weeks. Mine took over a week.
Phase 1: Initial application, I think it includes the written material they ask you to complete too.
Phase 2: Speed maths test, 15 questions, 15 minutes, basic maths functions etc. Again, plenty of info in the thread above. You'll have roughly 75 minutes of PILAPT aptitude tests to complete, they test capacity, spacial awareness, handling skills and orientation etc. Challenging but quite enjoyable when you look back at it.
Phase 3: Same day as the second phase and involves two group exercises. If you pass the above, you'll be called for an interview mid to late afternoon. The interview lasts between 30 and 60 minutes and covers both technical and non-technical qualities. Again, more info in the above thread.
Phase 4: Simulator exercise usually held in a fixed base 737-300 sim at Nursling with one of their training Captains. It is tailored to your experience and they test capacity and ability to improve and learn. The best phase by far!