A copy/paste from the Saab V4 forum.
"Just an update on this: the fuel hose I used was from Halfords (yes, I know...) rated SAEJ30 R6. As soon as I used it in the tank connection the car always smelt of fuel when I got in, but there were no visible leaks. I guessed it must be permeation so I recently replaced it with 'Gates Barricade' (or possibly 'Gates Greenshield'?) hose, to SAE30 R14T1 - sold as being low permeation, and that seems to have got rid of the smell."
So, R14 looks to be the minimum standard for E10.
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