Having 2 classic cars, a Triumph TR4a and a Series 2a Land Rover and after reading various articles in the press written by so called authoritative organisations namely the RAC and AA, which stated more or less that you were going to destroy your vehicles if you used E10 fuel, I wanted to find out as much information as possible about E10 fuel and classic cars.
At first, in the popular motoring press, I found mostly regurgitated information from the motoring organisations giving the same dire warnings. Then I found a book called "Classic Engines, Modern Fuel" By Paul Ireland. He carried out extensive research at Manchester University on classic car engines running on modern fuel including E10. I won't go into too much detail but suffice to say he provides solutions to many engine problems classic car owners have. Briefly, what he does say is that there is no problem with using E10 fuel. Your carb may need slight adjustment and over time it may dissolves the plasticisers in rubber and plastic components but this is easily solved by replacing them with ethanol tolerant parts. The greatest threat of using E10 petrol is caused by water getting into the fuel system either by absorption from the air or ingress through leaky filler caps. Ethanol makes the water significantly more corrosive this in turn attacks the metal components of the fuel system. With care precautions can be taken to reduce this risk.
I do use super unleaded in my TR but that is because it has a high compression engine and was originally designed to run on 5 star. My Land Rover will continue to run on 95RON unleaded now with 10% ethanol. If I lay it up over winter I will leave only a small amount of petrol in the tank and fill it with fresh in the spring.
I am not an expert but I was annoyed by all the 'Fake News' I was reading. Hopefully this will help clear up the confusion.