§ Mr. David Priceasked the Secretary of State for Defence how many of the charts currently on sale from the hydrographer's department of the Royal Navy are based on surveys made or revised in the last five years, the last five to 10 years, the last 10 to 15 years, the last 15 to 20 years and over 20 years, respectively.
§ Mr. JuddInformation is not available in the form requested, since most charts are based on a number of surveys made at different times. The rate of revision of charts is indicated in the following table: