Cost sharing - the CAA and the Aviation Insurers
Some good points here made about the ANO and how the CAA interpret public v private transport. Worth remembering that in the unlikely event of a mishap, the AAIB and Aviation Insurers will take a very close look at all the available evidence surrounding the flight. That often then results in the CAA taking a closer more forensic look at who paid for what.
I have seen aviation insurers declining to pay claims (hull and liability), and also leaving pilots in the lurch (having to fund legal bills themselves) where the line was crossed from simple cost sharing to something more commercial.