These are the parking spots around Castle Drogo. There’s obviously the parking at the castle itself, which is National Trust owned. However there are plenty of places to the south of the Teign valley to grab the hills around that area. There’s a couple around Butterdon Hill which can take 4 cars in total. You can get a few in below Uppacott Down, as well as the parking at Fingle Bridge both by the pub and in the NT car park at that location.