Thanks guys for the replies!
The examples I gave were only to show the type of emergency I was thinking of. In my case 1, I was just showing how an emergency could occur, without either the pilot being at fault or something happening to the airplane. And in case 2, I was giving an example of how the pilot could be at fault.
FFF-I agree that weather problems doen't always equal an emergency! But thanks for your reply. Helpful as always
I only gave different situations, on the assumption that there might be different requirement in different circumstances!
Just to clarify, and I'll edit my orignal post to correct; in my case 5, I was assuming that an emergency did happen during the flight, and that it was declared. The main difference being that the emergeny did result in damage or injury.
In any case it's good to know that there is no downside whatsoever in declaring an emergency.
Thanks for the replies.
dp