I'm not sure though that even a CPL holding non FI/CRI could conduct this flight legally as it would surely be construed as non-instructional 'aerial work' and need to be under some form of operator's certificate?
I don't think there is an "operator's certificate" for aerial work, is there? Art 6 of the ANO requires an AOC for public transport, but there's no corresponding requirement for aerial work.
All it requires is an aircraft with an appropriate C of A (in theory for aerial work but in practice there's no difference between that and a PT C of A) and a pilot with a CPL.
The PPL has no authority to take-over the command of the aircraft and must simply sit there and suffer while their fellow club member does their best to kill them both.
Perhaps he should get danger money... Oh no, that wouldn't work, would it?!
