What should UK applicants select when their nationality is British but it's not listed exactly in the visa application options?

UK applicants are facing confusion regarding the nationality drop-down options on Thai visa applications, as 'British' is not listed. Instead, options include 'United Kingdom' and 'British overseas territories.' Experiences shared indicate that approved visas usually state 'United Kingdom,' which reflects the official title of the country including Northern Ireland. Some applicants are concerned about district address listing discrepancies, especially those residing in areas like Jersey, Channel Islands.