So after a bit of prodding I realise whoever said I should replace the whole chassis cross member in front of the rear wheel was correct. It was pretty f*** up. So Friday Eve was spend hacking it out and sat/sun making a new one
The original has what I expect are "drain holes" bored in the bottom. I'm pondering whether to reinstate them in the new component. I am thinking I may go with plenty of seam sealer and make the new one water tight. Anyone with previous experience or advice on this thought!??