I had the same experience as Beans. Halfway through the actual exam I remembered that people who have been driving for a fair while spot hazards better, so did as Beans said and clicked first when I saw it, then a second or two later - ended up just scraping through with something like 5 max scores, 4 zeroes (including the double-hazard, and I know I saw the hazards on that because I remember thinking "well that is the double-hazard done, and it was easy" ), and a couple of 4s. I even practiced with the £2.99 iphone app, but I just had it propped up while I was eating lunch - I think that added enough of a delay, whereas in the exam room I was hunched there waiting like it was high noon.