I found the test was as much a learning experience as a test. Certainly the Examiner was an extremely experienced guy who had a lot of useful information.
I was quite nervous on account of being told I could teach Straight and Level Part 1 or Steep Turns. Despite being given the choice it soon became apparent the examiner really wanted me to pick Steep Turns - on a day with glowering clouds and a pretty indistinct horizon ! He said he would be the perfect student. I figured if he was happy doing it, then I would do my best !
The test itself was fine and quite good fun. I made one slightly silly mistake but was allowed to get away with it. It was certainly nothing like as rigorous as the CPL or IR skill tests. They are looking at your potential ability to teach in the air. They know it'll take time to become a fully proficient instructor.