Nothing whatever to do with Penzance vs Lands End this is just a blatant strategy by IOSSC to protect the monopoly they have held for 50 years.
If Penzance airport was to get the go ahead why on earth wouldn't IOSSC operate rotary flights from there as was their choice for many many years.
If the new service starts what odds when the bluff is called IOSSC make no effort to start a new rotary service from anywhere.