My recent experience with ethanol in fuel is that although it may state 5% ethanol at the pump the reality is that it's actually less. I found this out because up until last year I had a Ducati motorcycle that was fitted with a plastic fuel tank and it was common knowledge amongst owners, particularly those in parts of the USA that the ethanol fuel was damaging the fuel tanks.
I was curious about the fuel we had in this country and also concerned about potential damage to my bike, as a result I bought an 'Ethanil' fuel testing kit. Over several months I got fuel from several different local petrol stations and found that for the most part the ethanol content was less than five percent, usually around 2 or 3%, and never above 4%. I also found that the local BP garage Ultimate 97 octane was lower than 2%. I can't vouch for the ultimate accuracy of these tests, I just followed the instructions as per the 'Ethanil' kit. Needless to say I always used BP Ultimate whenever possible.
For the most part I'm refuelling my Jazz at Tesco using the 95ron cooking fuel. It runs fine.