Good news!! Got the gear box back in with the new bearing and it works perfect!
I put the failure down to hardened grease on the input shaft of the gear box not letting the bearing slide back in swiftly.
I cleaned up the flywheel with dry scotch bright (green scour) to get rid of some heat spots and general muck off them. Also removed all dust and old caked grease off everything.
When I installed the clutch/box back in I didn't put any grease on anything.
The clutch grabs and releases like it should now, no slipping or noise.
It even looses some traction when dropping the clutch into 3rd, mind you the tyres are a tad worn (50%) and the surface was fairly smooth.
All in all glad I tried the bearing first and cleaned it up rather than spending 1-2k on a new clutch straight away.
Thanks for all the help to people, much appreciated!!!