As far as I know, there are no R22s for hire in Cornwall.
Graham Barral has an R44 at Truro airfield for tuition, but probably not for hire.
I believe there is a consultant who flies himself to Treliske hospital in his own R22.
I have flown an R22 to Bodmin airfield, John Bray's pad at Rock and various other Cornish sites in recent times, but it was from elsewhere.
PM