Keswick's Theatre by the Lake has unveiled plans for a £700,000 extension.
It wants to build a cafe with views over the nearby fells.
The theatre's managers say it would be the biggest development since it opened in 1999.
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A mountaineer from Cumbria has written a book about the moment he watched his friend fall to his death in the Himalayas.
The draft budget for the 2015-16 financial year has now been agreed.
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