I live on the edge of the Peak District and wild camp there often without any problem. There are many more locations "to be found" than appear on the app, especially if you travel down some of the narrower roads. This past weekend we had two nights in the Manifold Valley, no problems at all.
As for being anxious about wildcamping, initially (several years ago) when I first got my MH, I thought like a caravanner; must find a place for the night. Slowly the penny dropped, now we seek out locations that have a grand view and park up. Unlike many farm locations and caravan parks surrounded by laylandii, we have a great room with a view in the country. In fact we have been taking photographs out of Vanessa's window as reminders of all the wonderful trips. At no time have we been moved on and we have been all around the area. A couple of farmers have dropped by to say hello, chat and enquire if we are ok. On a trip we follow the "leave no footprint" rule when we park up. Including keeping grey water on board, so when we leave there is no reason to complain.
Give wildcamping a go, once you get used to the freedom you won't regret it. We have seen no down side.