One of respectable Thai Businessman (retired) invited me to Indian Dinner. It was one of the best Indian Cousine I've ever tried. The place is called Charcoal Tandoor Grill & Mixology, located in Fraser Suites, Sukhumvit 11, Bangkok, Thailand. Highly recommended!
Update: 14NOV2015 (more photos) - went there again with old colleagues from Warwick, and my guests from Singapore and Malaysia.