Ten days ago I flew out of Sydney - destination "dream realisation!" I've had this idea to sail around the world for a while now, in fact I tried to work out when and how I first got this idea and haven't been able to crack it - the earliest confirmed mention of this was when I was 19... but I'm guessing it would have been born much earlier than that. Either way, it feels quite incredible to be on the eve of beginning to fulfill a…