How can I get a counter-signature for my son's British passport application while in Thailand?

A person is seeking advice on how to obtain a counter-signature for their child's British passport application while living in Thailand. They have all the required documents but do not know any eligible UK citizens locally. The community suggests options, including using a local agent like Paul King from Easy Visa Pattaya, contacting British expats, or attempting to have a long-known acquaintance in the UK sign the form. Some also mention the importance of having necessary documents, such as translations of the Thai birth certificate and registering the birth with the British Embassy, though registering the birth has become less essential recently.