 It was agreed that Dahlerus would return to Berlin and report with Hitler's reply.Dahlerus had become so significant, according to his own testimony, that he felt able to advise the British government that they should keep Ambassador Nevile Henderson in London until the next day so that he could better react to Hitler's response.On 29 August, at a meeting with the German Foreign Minister, Joachim von Ribbentrop, Henderson had been presented with a document containing sixteen points that Germany demanded agreement by Poland.