Gave myself a good dowsing in Chamomile Lotion and purchased a manual. As the cricket season is fast approaching, time is not on my side.
Anyway, after opening up the gearbox, it was pretty obvious as to what was wrong. The input shaft has sheared just behind one of the bearings and one of the large driven gears which houses the clutch discs is in need of some extreme dentistry, as it has lost most of it’s teeth!!