Ok so I might have fixed the corset but it didn't survive it's first outing. I went to the theatre last night to see Spamalot and by the time we got there several of the bones had pushed out at the bottom. It's the front 4 that have gone and all they have done is forced their way past the binding I put on. Solution: stronger and wider binding. So I'm gonna unpick all the binding, re-stitch the bottom and make some better binding for it.
I don't recommend sitting though something so funny in a broken corset, I have some lovely bruises :o(