What do UK nationals need to bring to the immigration office for a tourist visa extension in Koh Phangan?

When applying for a tourist visa extension in Koh Phangan, it's essential to be aware that each immigration office may have slightly different requirements. It's commonly noted that extensions can usually only be applied for during the final week of your current entry stamp, so visiting too early might lead to being turned away. Always check for the specific documents required by the local immigration office.