Commonwealth Prime Ministers Conference : Sir Winston Churchill talking to Mr. R.G. Menzies, the Australian Prime Minister at No. 10. Downing Street this afternoon. Sir Winston Churchill presided at the first meeting of the Commonwealth Conference of Prime Ministers which opened in London no. 10. Downing Street this afternoon. The conference which is expected to last nine days, will almost certainly discuss the present crisis in the far east. January 31, 1955. (Photo by Paul Popper, Paul Popper Ltd.).