John Stingemore, former deputy head of the Grafton Close children's home, is believed to be one of the men arrested by police investigating alleged child abuse at Elm Guest House.
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Penny Mordaunt called it an “historic and great” day for Ireland.
A 61-year-old woman was taken to hospital with head injuries after the incident in Islington, north London.
Counting will begin on Saturday morning, with the result expected later in the day.