Thanks for posting the info.
I do wonder if the 2010 PDF is valid post-EASA?
This is provided –
(a) no more than four persons (including the pilot) are carried
That does appear to ban
any cost sharing if >4 people are in the cockpit.
the flight has not been publicised in any way except within the premises of a flying club (in which case all the adult persons being carried in the aircraft must be members of that flying club).
That clause is very old. For example nobody has defined whether a totally online "club" qualifies. If not, all those pilot forum "spare seat" adverts (which are obviously cost sharing adverts, given that many or most UK GA pilots won't fly at all unless they can cost share) would be illegal. I suspect the CAA does not want to test it in court...
I'm still searching for a definition of the "direct cost" of the flight. Can we include the travel to/from the airfield? Like the landing fee, this is money I would not have spent had I not been making the flight.
That one has been doing the rounds for ages, too