After months of taking things out, un-seizing components, dismantling and cleaning them up they were actually going back in and in an operational state. Most satisfying was getting the clutch pedal back in which now moves beautifully up and down as it should and so does the brake pedal. The steering box was refilled with SAE90 oil, I had un-opened bottle on the shelf dating back several years.
The front under dash body work brace that ran left to right (or vice versa) was re-installed, pipes pushed back on to the heater outlets and suddenly a faint glimmer of light was on the horizon. However, my next project is proving to difficult. The removal of the brake pipes to release the brake master cylinder is proving to be tiresome. Not wishing to round off the nuts they have all been liberally soaked in WD40. With some patience I hope they’ll loosen soon.