Okay, this is the work I had done to rectify vertical and lateral movement in the steering shaft, felt by moving the steering wheel in any direction, and a rattle - chatter noise emanating from the steering column over a bumpy surface:-
1. R/R steering wheel, speedo, tacho and wiper, indicator and ignition switches.
2. R/R fresh air fan/plenum box assembly, replacing upper and lower bearings, retaining clips and shear bolts. (They would not entertain the idea of a quick fix "bearing sandwich" - tapping a new bearing over the old one, leaving the defective bearing captive in the steering column. I still think this is a neat trick for a DIY, but what do I know)
3. R/R Steering universal shaft and rack coupling. tightened rack yoke nut.
4. and whilst they were at it - Replaced front sway bar rubbers, wheels balanced and new brake calliper kits and hoses all round.
WOW! I've got near-as-new steering.
Everything is FIXED - no wobbles or rattles and tighter at the wheel.