Car Farting Noise/Vibration from NSF mostly when turning right.

First timer posting a new thread, be gentle with me,

Car is an 3.0 quattro Avant.

I've recently had the latest full service done, with brake fluid change, and new pads/discs(rotors) all round.

After having this done my car developed a nasty farting sound, akin to something rubbing along with localised vibration in the passenger footwell more toward the outside of the car than the inside.

There is NO vibration through the steering wheel.

This was at its worst when going round roundabouts, mostly when turning right but occasionally when turning left.

I found my undertray loose, so bought the fixings and reattached it but the sound continues. I've checked the brake shield is out of the way also.

Recently it also seemed to be making a noise when driving straight but a very low hum.

I decided to get it looked at and have the wheel bearing done too. This has been completed along with the NSF lower arm being replaced as my tyre was showing uneven wear and I had a clunk when going up my dropped kerb which has now stopped.

However, I still seem to have this damn farting noise & vibration.

What do I look at next? I'm baffled.