Re: Law in the UK is clearer.
Is the 500 foot rule mentioned in the article an FAA one? The article suggests light aircraft must remain above 500 feet. The CAA rule is something like "except for the purposes of take off or landing, 500 feet FROM any vehicle, vessel, person or structure". Note those 4 items you must stay 500 feet from do not include the ground or water. If you can in the crowded UK stay far enough away from any of those then you are free to hedge hop without breaking a low flying rule (they will probably try and get you on another rule though).
During PPL training, one of the fun parts of the course is the practice forced landing, the aircraft doesn't actually land but some instructors like to take the opportunity for a bit of hedge-hopping.