Do I need a solicitor to sign a letter for my child’s travel to Thailand if she has her father's last name?

The user is inquiring about the necessity of having a solicitor sign a consent letter for taking their child to Thailand, given that the child has the father's last name. Comments suggest reaching out to the embassy via social media due to difficulties in calling. Additionally, it's recommended to have the letter signed, dated, and certified, along with carrying the child's birth certificate for possible requirements from UK immigration or airlines, as well as Thai immigration.