Michael Schumacher is "making progress" and "showing moments of consciousness and awakening," his agent has said.
The racing driver, who suffered a severe head injury while skiing off-piste in the resort of Meribel in France last December, remains in an artificially induced coma.
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The Prime Minister has praised the former soldier's "huge professionalism" in trying to save the life of Pc Keith Palmer.
The man who carried out the Westminster attack is thought to be British born and was once investigated by MI5, the Prime Minister has said.
Jason Day, who lost his father to stomach cancer at the age of 12, broke down in tears as he explained his shock exit during the WGC event.