I was a big4 auditor before taking my secondary PGCE.
I am enjoying it a lot and I have no regrets on doing this; I feel teaching is much more fulfilling as a career, especially when things go well...
However, it is also much, much more tough than office work, not least because the level of responsibility is much higher. So I would only recommend the move if you are very convinced about it. Perhaps you could observe in a school a couple of days and talk to the teachers there, this could help you out.