I know its not any of my business. But why on earth would you want to convert from GCAA to JAA especially if you obtain it from the likes of etihad, you're probably going to have more money and a relaxed lifestyle working in the middle east.
Anyways with regards to your question, I think you have to take the 14 groundschool exams and re-take the IR test and also demonstrate your competency on the aircraft you are type rated on