Evening all, I did the JEA selection a couple of years ago, and from what I remember, JetsetPete has described it accurately. You can find out more about morrisby tests at their website. The Pilapt tests were quite hard (even though I'd already done most of them for the UAS). As you say, right arm green etc,. flying through boxes, and a really hrad spatial test. Incidentally I dis really badly at the spatial test, but still went through.
The interview is informal. I believe they did ask 'what do you know about JEA?' so gen. up on them. The web and aviation magazines should provide enough info.
Best of luck, and if you get through, Raw Data's your man to ask - he hepled me tremendously.