pax
"Whatever happens I can see a mandated introduction of GPS location reporting for all long haul aircraft relaying constant position reports via a secure sat comms link with no access or control function from from flight deck "
Yes, that sounds like a really good idea.
Can't think of anything more sensible than a piece of electrical equipment on an aircraft that cannot be turned off by the pilots in an emergency.
All those pilots considering murder/suicide will be deterred by a comms unit telling on them.