text:  This is Andrew Peach in London with news of worldwide computer problems caused by a faulty software update. The cybersecurity firm CrowdStrike says the underlying cause has been fixed, but the impact is still being felt. Some airlines have grounded planes. There are chaotic scenes at airports in Sydney, Tokyo, Amsterdam, Budapest. In Delhi, passengers are being processed with whiteboards and pieces of paper. 1,400 flights have been cancelled.