Regrettably, the battery doesnt seem to be the problem.
I have a spare battery, fairly new, that I have charged up. Able to crank my old Morris Minor with ease so should be in reasonable shape. Using jump leads I connected in parallel with the battery in the boot and ran it for a short distance. No change to steering effort.
I agree about the UJ's. I got it up on ramps yesterday and took to cover off. All mechanicals visually fine. Nothing loose or dirty, corroded etc.
Just another piece of the jigsaw; I had the alternator replaced due to bearing failure last month. I checked voltage with engine running @ approx 13.5 to 13.8V depending on rpm. I was expecting it to be over 14v. Battery volts were 12.5v. Do you know what the charging volts should be? Mind you, if battery eliminated, this would not be relevant.
I have booked car to go to a local independent specialist for a diagnostic check on Monday. Will report back.
Thanks again, Geoff