Thanks Jack & Worrals, thats put my mind at ease (well a bit...). Just looking at the latest VAAC maps and it looks like another big cloud is comming our way but at a much lower altitude (FL050/FL200 - 5000 to 20000 ft I think) so no way anyone will be flying in that I would guess. The fact that the NZ Met service is forcasting the cloud does not exactly fill me with confidence as they could not forcast a piss up in a brewery!!