I've had the car tuned by Racetorque the other day and they didn't say there was an issue with it, the squeak isn't audible when I'm on open road, it's more when there's no other noise around or when I'm next to concrete dividers on the highway etc that bounce the sound back to the car.

Can't remember if the sound goes away if I put the clutch down. Considering it squeaks even when the car is idling would it still possibly the turbo?

Just want a heap of options really to give my mechanic to see what he thinks, it sort of sounds like it'd be a pulley or something of the sort, but I haven't had a chance to hoist it lately to give it a decent check.