I returned a result at 23:42 18/7/09 UTC. And no sign of it on my task list, very strange. I suspected there might have been another earlier in the day but can't confirm. Has anybody else had this issue today ?

Found it, task No 230975.....I hadn't realised that the list is not in chronological order, but listed by task number. It would seem the task had been sitting for a while before being issued.