I wouldn't be thinking about ethanol free fuel if I had a bear with me!
I know that they sell ethanol free fuel in Castle Combe and it's used by classic cars. I bought one of these for my tank. https://www.flyingspares.com/fuel-diamond-0558775.html Seems to help. I always use Shell power where possible.
Admin: Fixed the link.
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Why do things simply when you can complicate them