In the days as a new teacher in a sixth form, I had a timetable of 24 lessons a week. I worked in the evenings and the weekends but i still had to walk into lessons, knowing what I was about to teach, just not with a structured lesson plan either mentally or on paper. I have to say, I was a pretty ok teacher in those more spontaneous lessons ...roll on a decade and I have less hours on my timetable and I'm physically unable to walk into a lesson without lesson objectives, structured Paul Ginnis type activities planned to within an inch of their life, plenaries, differentiation, refs to SMSC and employability etc. My students achieve as well as they did when my planning was much more skeletal in the early days but my enjoyment of the job and the challenge has diminished. Don't get me wrong, I don't think I could ever walk into a lesson and totally make it up in the spot but I do miss the freedom and flexibility to go off on a tangent and just talk to the class or experiment with another teaching method. One of my best lessons ever (and this has been corroborated by two ex students who cite this lesson as their reason to become teachers) was when I felt the students had had enough of my teaching from the front that day so I asked them in pairs to each teach an aspect of the topic they were studying. They did brilliantly. Does anyone else wing it a bit?