If others have had the same issues on the same fuel, then that's what I'd be looking into.
I know with my car I had some rough idling on cold starts a while back... Only ever first start of the day. I wasn't the only one. Interestingly a few people had the same issues and all found it would resolve by moving from BP Ultimate 98 RON to a 95 RON fuel for a couple tanks. It must have been part of the additive package causing some issues. It was soon after they released their adverts regarding "cleaning the engine" etc... detergents.
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