After four pages of moaning and hearing “B2N2” cry about rich folk going to lunch via helicopter, I picked up the phone and called them myself. My result, was:
ME “I’ll be in the area next month and interested in a possible lunch booking; I’ll be arriving by helicopter, is that OK?
Hotel “Yes, we just ask for a completed form and copy of your insurance
ME “That’s customary; is there a landing fee if I have a lunch booking?”
Hotel “No Sir, there’s no charge, just let us know the dates you’re interested in”
...I can only assume I have a more soothing telephone voice than the OP.