Don't forget the rules of common sense always trump the CAA rules, and you can get to those in two easy questions:
1. Do I need to do this?
2. Could it kill me (or someone else)?
It's worth spending as much effort on seeing if there is a more accessible and less hazardous (legally) landing site nearby, as it is trying to arrive at a predetermined conclusion about the suitability of the original landing site.
That's real Airmanship.