A Superintendent Registrar may accept notice for a marriage to take place in a foreign country between a British subject and either a foreign subject or another British subject.
He/she may be able to issue a Certificate which can be produced to help the procedure abroad. However, the rules vary and you should consult the Superintendent Registrar.
Sometimes it is possible for a record of the marriage to be made under the Foreign Marriage Order 1970, but this is not always the case and you should consult the Superintendent Registrar for more details.