"The Plague of Peacocks"
is a short story for younger readers by Diana Wynne Jones.
The Platts move to Chipping Hanbury and begin to look after the village and its startled inhabitants. They look after it so well that very soon people are wishing they would go and find another village to look after. The only thing that keeps them going is the thought that soon the Platts will decide to look after [Daniel Emanuel]?
. Luckily, Daniel Emanuel is not very impressed with the Platt's efforts to tidy his life.
It is in several short story collections: Warlock At The Wheel: And Other Stories and Unexpected Magic and Puffin Post Vol. 13 no 4.