Only idiosyncracy I found...
LFAT had a thing about holding constant speed when I approached. I tend to let altitude wander a few hundred feet whilst flying (unless expressely told not to by ATC). LFAT didn't seem to mind that but if the speed wandered they asked me about it.
Speed wasn't varying by very much, maybe 10% max but it appeared they wanted me to hold it bang on.
Maybe there was something else going on ? Not sure, but it was the only thing I found a little odd..