Scotland Yard said de Zoysa, of Park Road, Banstead, Surrey, has also been charged with possession of a firearm and possession of ammunition.
He will appear in custody at Westminster Magistrates’ Court on Wednesday via video link.
De Zoysa has been in hospital in a stable, non-life-threatening condition. Recent changes to his condition and a charging decision by the Crown Prosecution Service resulted in de Zoysa being charged on Tuesday afternoon, police said.
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