it is very possible they have been giving it big licks to try n clear it out as some of those fiestas are renound for failing emmisions some times small exhaust leak or lambda probe wires broke,,, im a mot tester so my advise is to ring them tomorrow and ask for the phone number for the local vosa office and your going to complain to them!bet ya they dont want them involved at all they will either fix it or pay u what its worth as its there fault if any thing is untoward during cat test u should abandon the test rather than risk engine damage ie overheating fan not cutting in and funny noises,ive been testing since 95 and have abandoned a few if ive heard noises or temp gauge goes up 2 much as the garage is liable and they wouldnt want to pay for my mistake good luck and if they dont play ball ring the vosa helpline and go from there