A website tracking the movements of the Coastguard helicopter shows the part of the lough that is being targeted in the search and rescue operation.
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The event, which was held at the Dorchester Hotel last Thursday, was attended by representatives of some of Britain’s biggest companies.
Reports in the Daily Mail and the Telegraph said published guidance has been changed for 2018 to only fly the Union flag on Remembrance Day.
The author, who explored feminist themes, was best known for her Earthsea books.