Turbo pipe

Agree with you local guys.
Anyway the pipe will need removed for inspection.
Or if you can find a garage equipped with a smoke leak test machine that would confirm or not without stripdown.

Can anyone tell me where the turbo pipe is/the exact name of it (so I sound like I know what I'm talking about at the garage)/deceive what the turbo pipe is responsible for....?

Thanks people!

Turbo fits into the exhaust,
Exhaust gas pressure spins an impeller so pressurising the intake.
Basically force feeding more air into the intake manifold.
And frankly buddy if you can't find it you really shouldn't be looking for it.
No offense.
As stated in my previous answer get it smoke leak tested.
Find a garage that has the Equipment.
What it involves is smoke from this special machine is injected into the intake manifold and if there is a crack or anything else smoke can be seen coming out of the area.
Pretty much failure proof.
I did a Merc ML diesel in front of the owner and didn't even get to call it,
He shouted "it's coming from there!".
Which in his case was the inlet manifold.
So even looking by eye it wouldn't have shown up anything without the smoke machine test.

That's brilliant info thanks. I wouldn't dream of attemping it myself - I just like to learn as much as possible.