The chief UN nuclear inspector said Wednesday that there was \"still a lot of work to do\" with Iran over its contested atomic programme, after returning from a three-day trip to Tehran. \"We are committed to resolving all the outstanding issues and the Iranians said they are committed too. But of course there is still a lot of work to be done, and so we have planned another trip in the very near future,\" Herman Nackaerts told reporters at Vienna airport.