Finding super unleaded petrol stations

What are the "cleaning" additives? Because I can never find any information on it, only marketing nonsense. AFAIK all fuel has to have cleaning additives as standard as part of emissions controls.
 
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There are services aling the A40, at St Clares and Narbeth I think. Pretty sure these will have Super Unleaded available. Haverfordwest would probably have some too as that's a big town for West Wales
 
Just having been in newquay for 10 days, I had to brim with 95 (knowing that I'd fill up again on the motorway). I figured it wouldn't be getting much abuse on the motorway so it would be fine.
 
I made the mistake once putting 95 in my car during a track day as there was no premium available nearby and it didn't like it at all. Kept fuel cutting and was horrible to drive. My Saab 9-5 specifies 98 Ron and feels a lot better on it. Even my Ignis Sport specifies 98 Ron but it has 11:1 compression ratio with its little 1490cc engine.
 
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