The Andrew Marr Show opened with the following statement wishing the programme's presenter a speedy recovery.
BBC News' deputy political editor, James Landale, is standing in for Andrew Marr who is recovering from a stroke.
Hello and good morning. It would of course be a better morning if Andrew were here and not me, but I'm keeping the chair warm while he is away getting better.
We all look forward to his speedy recovery and wish him and his family well and all the best in the meantime.
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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.
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