Tin Tops and the Green Man by D W James
Tin Tops is the name of a cottage, overgrown with ivy, tucked away behind a rickety-rackety gate in the countryside teeming with wildlife. There is an air of mystery about the place. Its walls seem touched by magic. But for how much longer will it last? A company is planning to move in and develop the land. Everything will be destroyed unless something is done. All that stands in the company's way are two young children called Donald and Molly, the recluse who lives at Tin Tops, and the Fabled Green Man, the fabulous protective guardian spirit of the countryside.