The figures are announced in the annex to the 1990 report of the Interception Commissioner which was published earlier this year. Some 515 warrants were in force on 31 December 1990 or issued during the course of the year and 68 were issued on the authority of the Secretary of State for Scotland. The Act requires that I issue a warrant only in particular well-defined circumstances and the use of that power is subject to review by the Interception Commissioner, who can look into the circumstances of each individual case. His report is published and is a public document, as this one was, and that is an appropriate and sensible method of regulation.