Nancy from Ontario helpfully mentioned ... "When I'm looking for an obscure
place, I first go to
which lists hundreds of places and gives you their geographic co-ordinates".
She added a list of the entries which the site had for Heaton ... "Unfortunately,
none of these appear to be in Devon" ...
This useful site lists 45,000 UK place-names and is indeed well worth knowing about. There
is another site, however, which lists 250,000 UK place-names, and links it's gazetteer
directly to O.S. maps.
It is called
and a search for Heaton in that does show up Heaton, just South East of Barnstaple.