During my research about my fathers career I came across these documents showing his flight in G-ALSA RMA CATHAY Statocruser on his atlantic crossing from New York to London in November 1953. At 0300 hrs the passenger written flight update shows they would pass HM Queen Elizabeth's aircraft on its way from London to Gander. G-ALSA subsequetly crashed on Christmas day 1954 at Prestick and all on board perished. The accident details are on Wikapedia.