Did mine last year and really enjoyed it. About a day or so of groundschool looking at all the Standards Docs, Flight Examiner Handbook, regulations, how to conduct tests etc.. Then sample briefings and conducting a PPL test with FIE as a dummy candidate, debriefing it etc.. I also did some IMC test bits in the dummy test. You need to know the regulations and FEH / test contents in really good detail, I found fillng in the PPL test forms with various failure scenarios needed a lot of pre-reading. You will need CAA approval before booking the course and test - unless there is a need for another FE in your area you will probably get turned down by them.