Bookworm.
Yes, your last line sums up the unfortunate situation we've got into in the U.K. An individual incident is the only way that any specific guidance is recieved, and that means some poor s*d has ended up in court. I well remember the Guy who was prosecuted for making a practice approach to a strip and overflew an ex-RAF officer who happened to be fishing nearby! Or a case that involved the legal argument that the centre of a village was 'the congested area of a city, town, or settlement'! I know there were other features to both of these cases but increasingly the defenition of the law is very grey for those of us trying to obey it!
Spiney