 She is described as being tiny and old with a conductor's baton behind her ear and having grey frizzy hair worn in a plait twisted round the back of her head and having three chins as a result of her habit of pressing her jawbone onto her chest.In the TV series, her name is given as Davina Bat and her personality is changed from strict to loopy and eccentric.She keeps the baton behind her ear but her hair is mousy-brown rather than grey and the plait twisted round her head is changed to a bun.