@James *****
I had the same your international license it’s only valid for 90 days in Thailand even if your license is valid for one year ..
If you have an accident the first think insurance ask is for your license and passport thy check to see if your IDP is valid and check you arrival stamp on passport it’s only valid for 90 day .. I had an accident no fault of my own I was inside off the period so I was ok but the insurance broker who came out to the accident advised me to change to full Thai license …