From what I've read, the esso supreme+ 99 contains no ethanol, in most areas except teesside, Scotland and somewhere else I can't recall.
Be careful assuming that the higher RON grade doesn't have ethanol in it, it's not widely publicised but petrol companies are actually fined around 30p per litre if they OMIT to put in at least 5% ethanol
With the profit margins so tight on fuel, I very much doubt the fuel companies would ignore blending some Biofuel (like ethanol) and loose 30p / ltr
