How can I extend my stay in Thailand from 30 to 40 days on a visa exempt entry?

If you plan to stay in Thailand for 40 days, you have a few options. You can enter Thailand on a 30-day visa exempt entry, which is available for travelers from certain countries, including the UK. To extend your stay by an additional 10 days, you can apply for an extension at a local immigration office in Thailand for a fee of 1,900 baht. Alternatively, you could consider applying for a 60-day tourist visa at the Thai embassy in the UK before your trip, which would allow you to stay without needing to extend your visa locally.