Thanks for the replies.

Had it apart today and there's nothing blocking any intercooler pipes at all, and the inlet manifold seems clear.

Although i can't see in the intercooler for any blockages.

Even the intake and airbox are clear and nothing has any signs of damage.

Another thing i checked was the actual turbo, and although there's no excessive shaft play the intake wheel does not spin freely, and at some points feels slightly stiff.

How easy should it spin? For example if i spin it should it keep spining for a second or not?

The ignition all seems in good working order and was only replaced about 2000 miles ago, dizzy cap rotor arm and spark plugs.
