In this park which is directly underneath the London Heathrow airport flight path there is a designated flying field From which RC planes have flown for many years. If you use Litchi there is a warning where you are only . In DJI Go 4 there is a splash screen where you have to click that you are authorised and that you accept all responsibility. After clicking it works fine. Nice for distance checks but fairly boring being only grass and trees. For the first time there was one other drone owner operating at the same time. Looked like a phantom but could not be sure.