I always use E5, which (I'm told) often doesn't contain any ethanol as the '5' part is the maximum allowable.
Not quite. The 5 in E% stands for 5% ethanol
In the UK E5 is 'up to a maximum of 5%'
There are still some fuels out there that are marked as E5 but have little to no ethanol, although this can vary by location. (Esso Synergy Supreme +99. Tesco Momentum 99 and Shell V Power 99)
although Esso was ethanol free in the South of England in particular, as of Sept 2023 they announced that they would be starting the transition to e5 proper, so i reckon by now, ethanol free fuel is unlikely to be obtainable
If you do a search, AI is still quoting the pre 2023 situation so not to be believed..