All the places in this story, Lingwold, Mallington Moor, Uthering, all appear to be made up.
There is a village of Lingwood a bit east of Norwich in Norfolk county, but 'wold' means an upland area, typically a moor, which is quite different from a wood, so clearly the one is not a substitute for the other.
Uther, of course, is famously the father of King Arthur, but there's no place named Uthering that I can find.