asked the Secretary of State for Prices and Consumer Protection if he will list those topics on which it is not his practice to answer parliamentary Questions; and if he will list any changes in practice since 1972, indicating in each case the date on which the change was made and the relevant reference in the Official Report.

It is not possible to provide a definitive and exhaustive list of subjects within my responsibilities on which I might, exceptionally, decline to answer Questions on grounds other than cost and commercial confidence. Each Question tabled to me will continue to be considered on its merits.