As everyone says it's good to know nobody was seriously injured . Interesting to see this report and I wonder if it will result in any action by the CAA. In the gyroplane world we had one tragic fatal accident when a door came open on a low time student pilot and they mandated that all UK Magni M24's be fitted with door open visual alarm and the manf also included an inhibit on the rotor tachometer to ensure the P1 is well aware of the doors being secure prior to pre-rotation and taking off . Having all of that I still make sure passengers know how to check the door is latched shut / how to open it in an emergency (once on the ground) and pre takeoff checks include hatches and harness's locked with an elbow push on the doors to be sure.
BG