Jeannie Baker's dual-language Mirror celebrates what matters most at Christmas, while Lauren Child's Slightly Invisible is the author at her playful best, says Kate Kellaway
The Hunt for the Scroobious Pip reads like an absurdist version of Aesop – a conference of creatures debate the taxonomy of the Pip, which is neither flesh nor fowl, writes Alfred Hickling
Tutti Frutti's latest show, When We Lived in Uncle's Hat, at the Theatre Royal, York, elegantly adapted by Finegan Kruckemeyer from the charmingly surreal book, is a showpiece of masterful clowning, writes Alfred Hickling