News At Seven-Thirty highlights:Mainland activist Hu Jia released from jail; SAR government defends by-election law; China’s premier arrives in Britain to boost ties; China and Vietnam have pledged to resolve their dispute over the South China Sea through peaceful negotiations; Ten Pakistani policemen killed in Taliban attack; UK renders sprout warning over French E.coli outbreak; Heavy rains and snow melt flood areas in U.S. from Montana to Missouri; Health Secretary York Chow defends quota on pregnant mainland mothers giving birth in HK; NPP offers proposal to restructure the government;Outsourced temporary actors for TVB claim their agency fails to make MPF contributions; Chinese Chihuahua mix gets World's Ugliest Dog Award in California contest.