A very nice chap called Angus had a look at my steering couplings and offered the opinion that it may foul the inboard suspension cantilever. After much angst I had to agree with him so I spent the next day modifying the steering so the shaft now comes out into the front foot well where the designer intended. It involved fairly extensive mods to the foot well, lower bracket and lower bearing position.
The plate illustrated below was uprated to 3.5mm and hung upside down.
The coupling now exits in it's original position as designed but needed a repair to the footwell.
This is as low as the steering shaft can go so if it is wrong now then that would be a problem.