Just sayin'!!
North of Plymouth - could be Cornwall but only just if so!! Lol
http://www.plymouthherald.co.uk/plymouth-s-dawn-french-is-back-on-the-telly-in-new-sky-drama-and-it-was-filmed-in-cornwall/story-30015049-detail/story.html
Yes, Calstock is in Cornwall, but on the river boundary, so forgivable error. The church used is at St Winnow just south of Lostwithiel. Some of my family tree are buried there!
Think you'll find that Calstock is in Cornwall. Just sayin'
thanks