News At Seven-Thirty highlights: Michael Suen admitted to having illegal structures at home; 3 men who used a teenage boy to smuggle drugs were sentenced to jail; Obama is now in Britain after receiving a rapturous welcome in Ireland; 250 flights were cancelled in British airspace due to the spread of volcano ash from Iceland; police cracked down on a syndicate which recruited mystery shoppers; Electoral Affairs Commission discussed the guidelines on internet media coverage of elections; government defended its decision to exempt new car buyers in first registration tax; a pre-trial hearing was held into the alleged corruption involving Stephen Chan.