A bottle of Coke Zero in Montpellier, was the thing that made us look up Flavourings, we were so unwell and we'd been so careful.
The google results confirmed that if we were to see any of the following: Natural flavourings / Arôme / Aroma, it could be likely that Soy was being used as the carrier protein for the flavourings.
Manufacturers use a process from soy waste to create a single protein called a Hydrolysed Protein, to which they they can attach a flavour.
Recent EU regulations should ensure that if an allergen is used as the protein carrier for the flavourings, that it should be listed but there are exceptions such as if soy oil is used.
Labelling for whatever reason doesn't seem to have kept up with the regulations. There are cited issues with long-life items, loopholes & imports.
For now, anything marked Natural Flavourings / Arôme / Aroma is in my 'won't eat' category. I occasionally 'crack' and buy a packet of Haribo's but my body tells me for days after that it regrets it even if my taste buds don't.
I am waiting to see what the EU regulation changes in December 2016 will really mean to ingredients listings. Whether ingredients listings will be more transparent and whether it will feel like less soy is being hidden in the foods I eat.