To say it is fixed, well that is a question of testing over time. I never updated this thread previously, as the saga continued.
Shortly after the white smoke issue appeared, one day it would not start. After much faffing I found that there was not enough fuel pressure, as the pressure was getting leaked into cylinder number 1 as the injector nozzle was stuck open.
I suspect this might have been the cause of the smoke, as if when driving the nozzle doesn't seal properly then the smoke will appear!
Anyway that was Christmas 2018, after the one new injector all has been fine, I just replaced one with a recon injector at the time as they are £300+vat each or there abouts from Toyota.
Also the injector correction time values as I stated back in the original post showed the correction for number 1 was quite large, so I suspect this gives you a clue to the condition of the nozzles.
So fast forward to this weekend, it wouldn't start again, and guess what, it's got no fuel pressure again.... and guess what its burn't the tip on another injector.
I've pulled all 4 injectors out of it, and all 3 original ones are looking a bit sorry, the tips are distorted and burnt away. And number 2 injectors leaks all the time.
So I have ordered a full set of 4 new genuine injectors.
I've looked at pictures of used injectors on ebay, and they all have distorted tips. I would suggest this is a common issue.
Hopefully that will be the last of the smoke for another 5 years.... maybe... only time will tell.
Anyway hear is a picture of the tips, the one on the right has swollen and sticks open, the one on the left is still OK but is pitted and slightly distorted. I will take a picture of the new injector tips when they arrive.