A5 3.0 TDI 2011 Knock / rough idle when cold

XR4Y

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Hopefully some one could point me in the right direction as I’m Scratching my head on this one, I’ve started to get a rough idle in the last couple of weeks when starting from cold / been sat for a good few hours.
The shaking / noise has got progressively worse and can be felt through the car, it’s almost as if there is a mis fire but I’m not sure that’s what it is, there is No CEL or noticeable fluctuation on the revs.
happens just the Same with A/C on or off, increasing the Revs gets rid of it for a few seconds and then comes back at idle, does not happen when warm.
running fuel has been bp ultimate or vpower so I don’t think it’s fuel related.
Video below

Any pointers greatly received.
 
If it should help anyone in the future. The garage found that 2 injectors need replacement no2 and no6
Car is due to go back in a couple of weeks for them to be fitted as they have to get it approved by extended warranty and order them in.
 
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