The Duke of Edinburgh has left hospital where he underwent exploratory abdominal surgery.
Prince Philip was admitted to the London Clinic on June 6 and is expected to spend two months convalescing after being discharged today.
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The country's counter-terrorism forces have regained control of the facility.
The commissioner of the Metropolitan Police has said he cannot promise the public an attack will not take place.
The showers are likely to be particularly heavy across northern parts of the country.