Trans' box now in bits. Found lots of needle rollers in the bottom, cage from main ball bearing and the end of the dipstick.
Main bearing, now extracted with assistance from a large tyre lever, hammer and thick cloth.
The outer race of the needle roller bearing is proving more obstinate. Think I'll have to take it up to the farm and apply some heat to the case.
I also found the drive pulley welded to its shaft.
I may grind it off, or maybe just leave it alone.