Just a bit of an update.
Car overheated today as the rubber hose connecting the turbo water line to the block split and caused coolant to spray everywhere. Car had to get towed.
Which raises the question, if there was an issue with the cooling system, how much would this affect timing and if it does, what hardware will it affect to cause the timing issue (eg. the turbo becomes heatsoaked and in turn superheats the air)
Also worth noting the car has run hotter than normal since the timing issue surfaced, so not sure if timng issue and overheating issues are 2 isolated problems or are connected somehow.
Ideas and thoughts would be great