I have been researching this subject recently as I am also in process of buying an R22. The going rate based on a sample of three training organisations seems to be around £80- £85 + VAT if applicable per hour dry. All the three I have asked are highly reputable genuine operators. I am probably going to go for a no capital group arrangement to share the fixed costs. I don't really want to lease back to a training organisation for all the reasons the other poster gave, plus the main reason I am buying my own is the availability and convenience - which I would lose if it were to be located at a flight school miles away.