(b) Conversely, it may happen that a document contains information which under the current rules is of a type which can be passed to certain Commonwealth countries but that for some special reason, the Americans have requested that the information should not be passed to them by the U.K. Government. In such cases, which will probably be rare, the documents should be marked "DISCREET". Limited to the U.K. only." 6. It is desirable that the promulgation of the rules should be restricted so far as possible to those who are likely to be concerned.