BIH had identified another potential site (St Agnes? Can't recall now...) before closing the service. Another option was Lands End Aerodrome (St Just).
St Erth, on land adjacent to the mainline railway station. Killed-off by NIMBYism. Lands End aerodrome is owned by the Isles of Scilly Steamship Company who also own the Skybus operation. I can't imagine them offering to host a new helicopter operation...
Penzance is much quieter these days.