Hughesy,
If I remember correctly, a Hughes 500 with pilot and female English passenger took off in marginal weather froma camping hut in the milford area of the south island (very rugged dense bush). i believe they were suposed to be returning to queenstown??? anyway, got stuck on top of solid cloud cover, no idea where they were. last radio contact was that he was running low on gas. never been found. no ELT signal picked up. where would you start looking??