Just got back from some wild camping on Lingmoor Fell (by Lingmoor Tarn). Needed a place to park the car overnight. National Trust will only let you park over night if you pre-book and are a member. Go further along to the Old Dungeon Ghyl Hotel. £3 donation to Mountain Rescue and you can park there. Found an old post on this website from 2012 which wasn't sure if they still do it. Well they do. Came back from a night on the fells to a safe secure car.