HC Deb 16 June 1969 vol 785 c27W
86. Sir R. Russell

asked the Postmaster-General why some post offices, including some in inner London, no longer include the time of the collection in their postmark.

Mr. Joseph Slater

First class letters posted in letter boxes are given a time stamp for control purposes. Since 1922 times have been omitted from most printed papers, and more recently from second class mail, because in this case the date is sufficient.