Last Updated: Sunday, 19 August 2007, 10:37 GMT 11:37 UK Thailand's military coup leaders have won a referendum on a new constitution by a large margin, taking around 70% of Sunday's vote, exit polls suggest. It was the first vote to be held since Thaksin Shinawatra was ousted by the army last year and replaced with Gen Surayud Chulanont. About 60% of voters turned out, according to the election c