Got inlet off and cleaned it it was a bit messy but certainly not enough to be a problem. Took cover off rocker and inspected and there seems to be no carbon build up at all. Removed no 2 injector which had a small leak and re seated, cleaned up and replaced to proper torque. Replaced timing belt and pulleys while i was at it, blocked egr and replaced in a clean condition.
Started it up and it runs fine altho there is a small whirring bearing noise.(no smoke) I think i need to check turbo flow for piece of mind next and possibly remove sump. Not sure but the whirring at idle may be turbo but cant hear it on inlet side so may need to remove outside of inlet snail and listen.
sorry maybe a bit more than a quick update but thanks for reading anyway.