Thanks, idle screw adjuster is still there, there is definitely a screw in there.
Cable is tightened up to the point where the butterfly is 0.1mm off the the throttle body housing (I believe this is how it should me), just nudging the throttle cable is enough to make it move so no slack there either.
IIRC, disconnecting the ISCV when the engine is cold stalls it.

Don't worry about teaching me to suck eggs m8, I am sure there is something simple in all that that I have overlooked.