After his return he went to Australia with Colin Milburn to contest the first World Double-Wicket Championship, they lost to Gary Sobers and Wes Hall, beat Bobby Simpson and Garth McKenzie, lost to Bill Lawry and Doug Walters and finally beat Charlie Griffith and Rohan Kanhai. At this last game at the St Kilda Cricket Ground in Melbourne on Saturday, 12 October he had a pain in his arms as he was going to shower and collapsed to the ground. He was helped to a chair and then a massage table and a call was made to the crowd for a doctor. As he was taken away in an ambulance to Prince Henry's Hospital Charlies Griffith told him "Don’t' worry Kenny, you'll be all right". Simpson called his wife Ann, who flew in from London, and Ken was given a room with a view of the MCG. He had had a thrombosis, but the heart muscles repaired themselves and he made a full recovery. Telegrams and cards arrived from all around the world and the Chairman of Selectors Doug Insole visited him in hospital.