gatwick says if you fall between let say for dutan, 6 and 7 units they can retest you!! ie to average out the score, so is it accurate!!!
if city is saying the latter ie, if you score 6.01 its still a fail, i was also told that any readings from previous tests ' must be taken into the averaging' stage, erm where does it say that, and there i no set procedure for cad, if you goto city let me know and ill get you to ask some questions lol