Robbo
Cost break down:
All parts for rebuild, fluids, new valve throttle body $5600
Labour $1280
Note: The work did not cost me anything, it was paid for in full by the extended warranty I took out though AWN. For this reason I didn't quibble on the cost or shop around.
The work took around 7 weeks to complete, which was unacceptable.
The vehicle was returned with an AWD fault code (see my other post).
The rubber boot on the steering column where it penetrates the floor was
also incorrectly re-fitted (allowing a heck of alot of noise in) but I fixed that myself thanks to help and advice obtained through Google.