Hi guys & thanks for your input.
I'm pretty confident the fuel supply is good but I have just found out that one of the injetors was leaking and was resolved by a garage (not us) stripping and re-building it! They didn't fit a new HP pipe but, although there is a little dampness on the injector, there is no leak (ie: dripping fuel or puddles of diesel).
Both KTS and Snap-on showing CTS and IAT sensors at 215 deg. Also both showing rpm at 200 at idle when the true rpm is around 900. Having trouble locating the sensors in question but I'm not sure if my equipment is processing the info correctly. Live data is usually pretty good on petrol variants.
I have not been able to properly check feeds/earths to the ecu as I have no pin data for this vehicle.
Will keep you posted on my findings. Cheers - Paul.