The first test, codenamed One Tree, was a tower-mounted test of Red Beard, scheduled for 12 September. This was the main test to which the media were invited. Butement, Dwyer, Martin and Titterton from the AWTSC were present, and Beale arrived from Canberra with a delegation of 26 politicians, but weather conditions were unfavourable, and the test had to be postponed. The schedule was revised to allow for a morning (07:00) or evening (17:00) test, and after a few days of unfavourable weather it was rescheduled for 23 September. Once again the politicians arrived but returned disappointed. This put Penney under great pressure. On the one hand, if Maralinga was to be used for many years then riding roughshod over Australian concerns about safety at an early date was inadvisable; on the other, there was the urgent need to test Red Beard in time for the upcoming Operation Grapple, the test of a British hydrogen bomb. Whether Buffalo or Grapple was more important was the subject of debate in the UK between Willis Jackson, who argued for Buffalo, and Bill Cook, who argued for Grapple. Jackson's view prevailed; Grapple would be postponed if need be.