Hi Andy Not being funny, you say you have quite a good knowledge of falconry so you would no that even a common buzzard needs flying as much as possible in my mind 5 days a week min as all my birds are and need to go out and fly for a while not just out flying from fist to post my old buzzard will soar for hours on thermals at hack. You say you've read books etc have you been out with someone who owns both sorts of birds to see the pros and cons flying styles temprements etc of each species? If you haven't I highly recommend you spend a season out with someone with your chosen bird ie buzzard