HC Deb 15 May 1969 vol 783 c245W
Mr. Gresham Cooke

asked the Postmaster General to what extent the use of the new system of using numbers and letters at the end of addresses has caused delays to letters owing to the illegibility of the numbers and letters and the misreading of them by sorters.

Mr. Joseph Slater

We have no precise record but we estimate the number of cases to be small.