flybymike
You need to look up what happened after the "Bentine" accident many years ago. There was a famous comedian - Michael Bentine - whose son went missing in a Piper Cub out of Blackbushe. The wreck wasn't found for a considerable time and the rules for booking out were tightened thereafter...
The whole world is familiar with the Bentine incident, but there has still never been a legislative requirement to book out.