Hi Tezza and thanks 
The bedknife was ground and again the tech said it was fine. I cant see how it could bend(?) after its is put back as there is no great pressure applied inwardly or outwardly?? He checked the bearings and said they were fine. I was happy to replace them.
I agree that it will be cheaper to replace the bolts. (A/F or metric ???) 
Cheers
Rob