ragwort fork is pretty useful-for anything with a tap root. trouble with pulling ragwort is that it will regenerate from pieces of root left in the ground, which can't be helped even with a ragfork and it may not pop back up for a couple of years. However, consistent pulling will work although I would spray if I could keep stock off it for long enough. I'm surprised your sheep havent eaten it at rosette stage, sheep love it IME.