A large building with a green cross at the top indicates that a Thai hospital is below.  There are many in Bangkok, and a smaller number throughout the country. Many of the physicians at hospitals in Bangkok speak English.  In the outlying areas you may be challenged to find one who is conversant in English. 

Expats in Thailand must subscribe to private health insurance if they want coverage, as there is no government plan available.  UK residents will find that there is no reciprocal agreement between their country and Thailand covering them in the case of needed healthcare.

That said, medical treatment in Thailand is good, with many of their physicians trained in the west.  Medical tourism is now taking hold, with optional surgery coming in at a far lesser cost than in western countries. 

Pricing in Thai hospitals takes place before any services are performed, and the prices are fixed.  The patient is expected to pay up front. Don’t expect emergency service vehicles to transport you to the hospital, as they are relatively sparse even in Bangkok.

Medications that normally require a prescription are available over-the-counter in Thailand.  The prices are considerably lower, some having been priced at 10% of what you would pay in the U.S.  Many people stock up on their medications just prior to leaving Thailand to avoid the high costs at home.