188 Sir Thomas Inskip, U.K. Secretary of State for Dominion Affairs, to Commonwealth Government
Circular Cablegram B322 LONDON, 3 September 1939, 2.10 a.m.
CLEAR THE LINE MOST IMMEDIATE MOST SECRET
Please treat this telegram with extreme secrecy.
With reference to my telegram Circular C. No. 48 yesterday  containing Prime Minister's  statement at 7.45 p.m. yesterday.
Cabinet meeting after midnight have decided that British Ambassador in Berlin  should at once ask to see Ribbentrop  at nine a.m. today Sunday and at that interview inform him that unless the Chancellor's  reply is received by 11 a.m. today Sunday His Majesty's Government in the United Kingdom will from that hour regard themselves as at war with Germany.
Prime Minister proposes to make a statement in the House of Commons at noon today Sunday.