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The car is now completely smooth. Same road and conditions i cannot reproduce the issue at all.
You could tell on the first drive (<5 miles) after the change however that the fuel trims were still off as the car still wasn't quite 100%. Dont panic if you change your sensor and the car isn't 100% fixed straight away.
I think a good way to tell if its your O2 sensor as opposed to EGR, is to force a DPF regeneration. The stuttering was noticeably reduced with a very hot exhaust in my case. O2 sensors need to be at ~300C to work their best and to get the EGT's that hot, the ECU will reduce the EGR duty, as it needs to burn more fuel.
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