The statue, made by Percy Hetherington Fitzgerald is in Westminster at Aldwych & Strand behind St Clement Danes Church.
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It is strongly implied in the book that he is actually the Elizabethan occultist John Dee.
Charlie Fletcher's 2006 novel Stoneheart is also about children who travel to an alternate city named "unLondon".
George, the hero of Charlie Fletcher's children's book about unLondon Stoneheart, has a fight at the top of the Monument with a raven and a gargoyle.
The statue of Dr Samuel Johnson at the eastern end of the church land, comes to life as the character 'Dictionary', in Charlie Fletcher's children's book about unLondon Stoneheart.