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The previous information from Shell posted by @redhelpmenow is incorrect. Super Unleaded is covered by BS7800 and not EN228 (BS EN228 within UK Corporation jurisdiction).
(Only 95 octane is covered by BS EN228)
For Super, there is no bio- requirement. Any bio is greedy petroleum companies maximising profits. Needless to say, BP is the worst offender which is probably due to costs from the Deepwater Horizon disaster.

Does that make people think? Fining a company only costs people more and is completely ineffective at deterring company chiefs from certain decisions. Strangely, no one was jailed in respect of Deepwater Horizon but Dieselgate?

Something very wrong there.
Anyway, here is the link to the Ethanil site which supply ethanol removal kits. They have info about the varying ethanol levels in petrol which vary regionally and by brand.
https://www.ethanil.co.uk
 

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As things stand, bio-ethanol is the last thing to be added to petrol in the refinery. The reason is it is very unstable, absorbs moisture and goes stale within weeks.

When the moisture it absorbs from the air reaches a critical mass, it undergoes phase separation. This is well known and current UK 95 octane can form up to 0.7% water in fuel systems. It doesn't sound much but it is possible for it to become trapped in certain parts of a fuel system and cause resultant damage.

Check out motorbike forums and for those who use petrol powered garden machinery.

That said, take stuff on the Ethanil site with a pinch of salt. Bio-ethanol content is currently limited to 5% and it was previously more. Yes, it can produce water but there are fuel stabilisers such as Coval Aquasolve for seasonally used machinery.
 
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