On 2 June 1935, Ribbentrop arrived in London. The talks began on Tuesday, 4 June 1935, at the Admiralty office with Ribbentrop heading the German delegation and Simon the UK's delegation. Ribbentrop, who was determined to succeed at his mission no matter what, began his talks by stating the UK could either accept the 35:100 ratio as "fixed and unalterable" by the weekend, or the German delegation would go home, and the Germans would build their navy up to any size they wished. Simon was visibly angry with Ribbentrop's behaviour: "It is not usual to make such conditions at the beginning of negotiations". Simon walked out of the talks. On 5 June 1935, a change of opinion came over the UK's delegation. In a report to the British Cabinet, it was "definitely of the opinion that, in our own interest, we should accept this offer of Herr Hitler's while it is still open... If we now refuse to accept the offer for the purposes of these discussions, Herr Hitler will withdraw the offer and Germany will seek to build to a higher level than 35 per cent... Having regard to past history and to Germany's known capacity to become a serious naval rival of this country, we may have cause to regret it if we fail to take this chance...". Also, on 5 June, during talks between Sir Robert Craigie, the British Foreign Office's naval expert and chief of the Foreign Office's American Department, and Ribbentrop's deputy, Admiral Karlgeorg Schuster, the Germans conceded that the 35:100 ratio would be expressed in ship tonnage, the Germans building their tonnage up to whatever the UK's tonnage was in various warship categories. On the afternoon of that same day, the British Cabinet voted to accept the 35:100 ratio, and Ribbentrop was informed of the Cabinet's acceptance in the evening.