Since The National Archives holds historic records rather than current ones we are unable to help trace living people. However our research guide Tracing Missing Persons lists some of the options open to you.

Try to locate a copy of C D Rogers, Tracing Missing Persons (Manchester, 1986)

If you can't do the research yourself, contact the Association of Genealogists and Researchers in Archives. They can give you the name of an agent who you can pay to search on your behalf.