HC Deb 05 July 1939 vol 349 c1316W
Sir G. Fox

asked the Lord Privy Seal what warning provision is made in advance to ensure that in case of a sudden air-raid no confusion arises as a result of experimental tests of sirens which have accustomed the public to hearing these warnings and taking no action thereupon?

Sir J. Anderson

Every effort is made to warn the public in advance when practice tests of sirens are to be made. In the event of a sudden emergency the public would be notified by means of broadcast announcements and other means that the warning system was in operation.