Thank you for the report back on your experience. That is helpful.
As stated in my initial post I have tried everything in my armoury to shift the nut let alone the actual rod in the fitting. So I am at the point of raising the white flag and surrendering to the local garage. I don't have anything other than a small blow lamp to heat it up. But I do have spare links that I will ask the garage to fit and ideally I will service the arms that come off. It should be possible to reclaim everything one way or another by buying a spare assembly from ebay just to get hold of a replacement screwed rod if it is needed. Yes I believe the ball joint ends are available. The "rocking horse" part is the rose/swivel joint at the inner end. Reclaim that and we are "cooking with gas".

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