In my quest for just finding a pump with E5 I'd missed the fact that Esso are providing 'Synergy Supreme+ 99 premium petrol' which is actually totally ethanol free, even though Esso brand it 'E5'.

Sadly there are a few parts of the country that don't have it but I can fill up here in Herefordshire, next to Snoopy Towers in Evesham and around Birmingham, so over winter I can try to only fill up with this Esso stuff.

https://www.esso.co.uk/en-gb/fuels/petrol

Our Synergy Supreme+ 99 petrol has more cleaning power than our regular petrol – and includes molecules whose job it is to reduce the friction in your engine helping the moving parts work more efficiently.*

Although our pumps have E5 labels on them, our Synergy Supreme+ 99 is actually ethanol free (except, due to technical supply reasons, in Devon, Cornwall, North Wales, North England and Scotland). Legislation requires us to place these E5 labels on pumps that dispense unleaded petrol with 'up to 5% ethanol', including those that contain no ethanol, which is why we display them on our Synergy Supreme+ 99 pumps.

There's currently no requirement for renewable fuel, like ethanol, to be present in super unleaded petrol although this could change in the future, in which case we would comply with any new legislation.

For locations including Europe:

https://www.esso.co.uk/en-gb/find-station/?longitude1=-3.4088841701171857&longitude2=-2.0699254298828107&latitude1=52.01812886177633&latitude2=52.43870550218678&zoom=10

Very interesting Hugh, have just looked at the list of stations selling synergy fuel and there are a few near to me so will start to use it think