Originally Posted by RedTree
he does stay still when I tie him, and at the place where he lives and I take him for a walk around the paddock I can stop and he will stand there for however long.
Its just when I lead him outside the paddock.
He is also fine when I take him places and just tie him up go go stand for ages, its just going for walks really
Good, so this is really just learning to lead correctly in a different environment/situation (outside the paddock) that may be more exciting (or new or uncomfortable) to him. I would approach this just like you were starting from scratch teaching a horse to lead. Keep him on a short lead to start and practice walk, stop, walk, stop, turn, back, stand, etc. etc. Reward (however you choose to) every correct action as well as keeping his head down and relaxing.
Patience and practice like everything else. Your horse will learn that leading is leading, regardless of where you are.
BTW, I often see this in horses when folks walk them in hand in 'busy' places like roads, neighborhoods, etc.