Hamish McHaggis and the Lost Prince by Linda Strachan & Sally J. Collins.
In the highlands of Scotland there's a secret glen, hidden away from the eyes of men. It's a cosy place called Coorie Doon, that can only be seen by the light of the moon. If you're very quiet and don't start to blether, you'll find Hamish McHaggis asleep in the heather.
ISBN 978-0-9554145-5-8