Lucy Selby's pony appears in Postman Pat and the Beast of Greendale
Lucy Selby's pony is loose in Greendale. While loose, she causes havoc by eating Pat's sandwiches and Dorothy Thompson's carrots, and by knocking Granny Dryden's washing and Major Forbes flower pots. She also knocks Miss Hubbard off her bicycle and pinches her apples.
She is eventually found in the bell tower in the church after being tangled in the ropes and ringing the bell.
Because she has a pillowcase on her head after messing with Granny Dryden's washing, Miss Hubbard and the others think she is a beast.