See in todays DT that Argentina are probably going to cancel LAN Chile's overflight clearance to MPA thus stuffing up the only commercial flight to the FI.
They really have not heard that you catch more flies with honey
.
Might I suggest that HMG leases a Boeing 777LR to circumvent this silliness. It could fly London - MPA direct and still hold 2 hours of island holding fuel.
Rather like SAA flying around the whole of Africa to access Europe during the bad old days.
Where there is a will there is a way..............