Hi, thank you for your question. If he applies to adopt your son then your ex-husband has the right to contest this and you should be aware that the application must be submitted before he is 18 years old. Furthermore, if adoption is granted then your ex-husband will lose his parental responsibility and will no longer be liable for child maintenance.
In relation to locating your ex-husband there must be attempts made to find him and a tracing agent can assist in this.
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My name is ***** ***** I have been a solicitor for more than 30 years
You are running short of time and need to act quickly
The starting point is to make contact with the Adoption Section of your Local Children's Services without delay - they can trace your ex through the DWP you do not need to use a tracing agent
You can read more about the process here
most councils have much the same approach