500ft Rule
I suspect that one trap that could catch helicopter pilots out landing at private sites is that by the letter of the rule you are only absolved from the rule when LANDING in accordance with normal aviation practice: NOT when overflying the site to check its suitability, even though a Practice Approach is still mentioned in Ex. 26 in the JAR FCL helicopter training syllabus.
I seem to remember one of our fixed wing colleagues fell foul of this one, admittedly after overflying the strip several times, as it was held that he was within 500 ft of a person and had no immediate intention of landing.
As usual, we won't know until someone complains and it is tested in court.