This information is relevant to all persons holding FAA documents with no U.S. physical address of record on file with the FAA of the United States of America, who hold or apply for certain certificates, ratings, or authorizations.
The following link U.S. Agents for Service on Individuals With Foreign Addresses Who Hold or Apply for Certain Certificates, Ratings, or Authorizations will provide you with access to the information of the FAA’s website relevant to this subject.
It is important that you read and comply with this information, failure to do so could invalidate your documentation issued by the FAA and therefore cease your ability to operate or maintain aircraft on the ‘N’ register.
If your FAA documentation is not valid, then operating within UK airspace would be considered illegal, and the CAA may be required to take action against such persons operating without internationally acceptable documentation.
Reference: Department of Transportation, Federal Aviation Administration, 14 CFR Part 3, [Docket No.: FAA-2023-1194; Amendment No. 3-3] RIN 2120-AL85