TD.
I am most grateful for the excellent explanation. It helped a lot in my understanding of the operation. In the simulator we see occasional "firewalling" in error during manual throttle take off's but especially on manual thrust go-arounds. It might be only be for a few seconds at a time before the PNF can get his hands on the throttles to ease them back toward the correct go-around thrust position - but it happens all the same.
I may have to actuate the instructor simulator button that gives a varying EGT (I will check if there is one in our simulator) and perhaps do that during a go-around to see if an indicated overtemp occurs and if the crew see it happening and fix it quickly. Otherwise it is all to easy for crews to become complacent and not closely monitor peak EGT in the simulator because normally overtemp doesn't occur in the simulator at the max thrust position.
Thanks for the other replies which have been most useful.
TM