thanks for the replies. i've got it booked in to a Landy specialist called Keith Gott in hampshire to do, I've been there a few times for work in the past few years. I asked was it worth just patching it, but their mechanic said no way it needs replacing.
They said £225 in total to weld the brand new outrigger in, which I didn't think was too bad at all. I do highly recommend Keith Gott, they have been around for about 35 years and really do know what they are talking about - they won't rip you off, they are honest and if they say something needs doing you can believe it does.