After seeing your post here it prompted me to re'post one of mine from years ago
After some looking it to the fuels again, came across with this
Esso Synergy petrol
What’s in our Synergy Supreme+ 99 premium petrol?
Our Synergy Supreme+ 99 petrol has more cleaning power than our regular petrol – and includes molecules engineered to reduce friction in your engine and help moving parts work more efficiently.*
Although our pumps have E5 labels on them, our Synergy Supreme+ 99 is ethanol-free (except, due to technical supply reasons, in Devon, Cornwall, North Wales, North England and Scotland). Legislation requires us to place E5 labels on pumps that dispense unleaded petrol with ‘up to 5% ethanol’, including those that contain no ethanol.
There’s currently no requirement for renewable fuel, like ethanol, to be present in super unleaded petrol. However, if this changes in the future, we will comply with any new legislation.
https://www.esso.co.uk/en-gb/fuels