Ten of the best: owls said that Old Brown, the owl in Beatrix Potter’s The Tale of Squirrel Nutkin, lives on an island in Windermere, when it should have said Derwentwater. It also said that Lord Sepulchrave (in Mervyn Peake’s Titus Groan) “goes mad and goes to live with the owls”, when in fact Sepulchrave is devoured by the owls that live in the Tower of Flints after losing his mind and coming to believe he is a “death owl”.