I would send them off for meat together (it's cruel to send just one). Castration might calm him down but on the other hand it might just have little effect at all, as he has now developed all his male characteristics. A tup, who will get stronger year on year, who smashes up posts, gates and so on, will go for you next, and the ewes. Quite honestly the cost of castration of a mature animal is not cheap. I would spend the cash at the abattoir and enjoy some tasty meals. You could send them off in May, before they get smelly by tupping time, but after they have fattened on some Spring grass.