HC Deb 10 February 1943 vol 386 c1306
38. Sir Robert Rankin

asked the First Lord of the Admiralty whether, in order to protect vessels against magnetic mines, he contemplates, as in the case of the Swedish Admiralty, the establishment of demagnetising stations?

Mr. Alexander

Demagnetisation stations have long since been established in British and Allied ports throughout the world, in order to give merchant ships and warships of the United Nations protection against magnetic mines.