Congrats to sierrafery for saying in early posts it is more than likely injector seals.
Done the swap earlier today in between going out to do other jobs. So far I have driven it not too far but for 40mins and it would have normally stopped during that time, happily it ran without missing a beat. Another thing to note is I can not hear the fuel pump at all now even when at idle so although it didn't sound like cavitation it must have been air running through the return line.
It appears only the copper washer/s had gone bad as I didn't get any diesel in the oil but was obviously getting air in the injectors.
Oddly enough 1 injector had a different O-ring to the others so maybe they hadn't changed all previously. As for the injector seat they were all intact it was just that 1 injector had some kind of seal between the nozzle and body which the others had worn through or never had (just carbon build up in there).
Only small change I have noticed is a bit of a vibration and idle, not all the time seems to come and go. I have to recheck the auto fluid as some was lost when the cooler leaked the other day while chasing this issue.
As for the camshaft lobes and followers that'll be another day and more money I guess.
Thanks for everyones help and suggestions, I'm glad it is working again for now. It was really doing my head in.


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