Right, well, I moved my IAT sensor from the inlet manifold, as I was getting bad lean hot starts and so after reading all the hot soak issues in that position I have now relocated it to the plastic ( Pallnet) spacer, In this position, it gets far less heat soak and so spent alot of the day running the car letting it sit and watching the IAT temp.
Once upto normal running temperature, ticking over, it stays around 46 degress C when turned off the max it reached in the spacer position was 61 degrees. when started it still turns really lean 16-17 AFR so. After cygnusx1's comments, I looked into the IAT correction table and put some rough figures in starting at a+ 4% at 46 C upto a +18% at 70 C.
And now she Purrs like a Kitten after hot soak, So thanks Cygnus1 for pointing me in the right direction.
So as far as I can see the position of the IAT sensor makes little difference, as I would still have had to use the IAT correction setting/table.
But why some people have this problem, and some don't is a different matter,