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"I think the opposition party's power in the assembly went to its head," says Mr Breen.

"Everyone's kind of scratching their heads a bit here," Michael Breen, a Seoul-based consultant and former journalist who covered the Koreas, tells the BBC.

Philip Breen, who is responsible for the adaptation, first approached Mullan a number of years ago about an eight-hour passion play he envisaged with a community chorus.

The pandemic intervened and put his plans on hold, but a chance meeting with David Peace in his adopted city of Tokyo encouraged Breen to focus on the book.

In a statement, the BBC said: "People who work for the BBC are often in the public eye and under scrutiny, however, it is unacceptable for anyone to be the target of sustained abuse in the way that Rozina Breen, Elizabeth Green, Stephanie Hirst and Helen Thomas were over a number of years."