Pineau was less cooperative and left New York on 13 October. Lloyd later wrote that agreement had been reached on the Six Principles, but not on "how" to implement them, although he conceded that Nasser had never accepted the principle that the Canal could not be under the control of any one country. On 13 October Sir Gladwyn Jebb warned Ivone Kirkpatrick (Permanent Under-Secretary at the Foreign Office) that France appeared to be cooperating with Israel against Egypt, and had sent her ninety-five Mystère jets, possibly with French pilots.