Found a place local that deals with propshafts so fitting new bearings (didn't know there were any) and welding my column is not a problem and been quoted £25.
Removed all plastic from around column etc, all bolts and got to pin at bottom of shaft. Managed to undo the nut a tad but now any further loosening just turns bolt with it.
As bolt is round ended cannot grip it with anything.
Can't see how you do it from underneath so have been doing from above.
Any suggestions?