Incidentally the tree surgeon one is interesting - I talk to one of those regularly and he loves it - fresh air, more work than he can handle, countryside, work when he wants, loves wood, a real man's job, using his expertise and more money than I make doing this... Makes you think doesn't it?
funny you mention that, my next door neighbour's tree surgeon used to be a pilot, he gave it up to start the tree work and enjoys it more (and makes more) than he did flying apparently.