"jellycopter will not be able to operate under the military rules 
"
Cheers, Whirls - totally understood, thank you, as I am sure was the spirit behind my suggestion, nicely paraphrased in your own words, namely "
that there could be some contributors to Military Aircrew forum who will know the civilian rules" who might therefore be kind enough to provide the type of information that Jelly is "seaking" - sorry - seeking, irrespective of how, where, and what they do themselves. Hence my PS, which said
"Which, IMHO, is precisely why they are likely to have a better all round knowledge of the situation under discussion.
"
My apologies if this was not sufficiently clear for you.
Jack
PS "
a few years ago WPD were doing helicopter rides from the beach at Weston-Super-Mud"
In which case they should certainly know about liquefaction!