The meeting with Fermi yielded no supplies, but it did result in Pontecorvo receiving an offer from von Halban and Placzek to join the Tube Alloys team at the Montreal Laboratory in Canada. There was some concern from Sir Edward Appleton over his appointment, not because of Pontecorvo's political beliefs, but on account of the fact that he was not a British national, and there were already a large number of foreign scientists working on Tube Alloys. Appleton was ultimately persuaded due to Pontecorvo's reputation, and the fact that good physicists were in short supply. Pontecorvo was officially appointed to Tube Alloys on 15 January 1943, and arrived in Montreal with his family on 7 February 1943. The Montreal team designed a nuclear reactor using heavy water as a neutron moderator, but lacked the quantity of heavy water needed. In August 1943, Churchill and Roosevelt negotiated the Quebec Agreement, which resulted in a resumption of cooperation between the United States and Great Britain, merging Tube Alloys into the Manhattan Project.