What should a British citizen do if they cannot renew their Thailand Privilege visa due to lack of a birth certificate?

A British citizen, who has been a member of the Thailand Privilege program for two decades, faces an issue renewing his visa due to his inability to produce a birth certificate from his country of origin. The situation arises because, at the time of his birth, his home country did not issue birth certificates. The community suggests contacting a specialized lawyer for assistance, exploring options with the British Embassy for original documentation linked to his passport, and considering legal advice to address what they perceive as a potential tactic by Thailand Privilege to renegotiate their contract.