UK resident/UK passport ... When visiting Thailand later this year, I am heading to Malaysia for a few days mid-trip, flying BKK-KUL-BKK. Total length of my trip is less than 30 days UK to UK. Am I OK just using the 30-day waiver/permission to stay to enter Thailand twice within a 10 days or so, or would that need the expense of a multi-entry visa? TIA.