§ Mr. Meacherasked the Secretary of State for the Environment on what authority Burghfield Royal ordnance factory was removed from the 1980 revised second edition of the 1:50,000 Ordnance Survey map, when it was previously shown in the 1973 first edition, and still exists; on whose authority it has been replaced on the 1980 map by two non-existent streams flowing down to the Thames; and whether any other Ministry of Defence establishments which still exist have been removed from Ordnance Survey maps in the last 10 years.
§ Mr. HeseltineWhere matters of national security are involved the Ordnance Survey complies with Government requirements. Where these require the removal of previously mapped detail it is the policy of the OS to reinstate for cartographic reasons any relevant topographical information which appeared on earlier maps 331W of the areas concerned. It would not be in the public interest for me to disclose the number of such cases that have arisen in the last 10 years.