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As long as you don't have any modifications, then just put 95RON in. The car may lose a little top end power, but if you're using it to commute, you're barely going to notice. I've see people on the Facebook group claiming that the car MUST have 98RON as a minimum because "it says so on the petrol cap". Which isn't true (at least for my model year) - it says "Use 98RON fuel", but that's because it's recommended - there's no suggestion that you must ONLY use 98RON, or that anything less will cause your engine to explode. If you refer to the handbook, it does state quite explicitly that 98RON fuel is recommended for the best performance, but that 95RON fuel can be used with no detrimental effect other than slightly reduced power - but obviously, the inside of a petrol cap is a bit small to relay all that information so they just put "Use 98RON" on it. If you're looking to save some money, which is perfectly understandable especially when doing high miles, then I'd just switch to 95RON and not bother with additives personally. Obviously this may not apply to modified vehicles which have been mapped specifically for higher octanes.

I use Sainsburys super unleaded 97 now because it's much more convenient for me and cheaper. I average 500 miles per week. The mpg is currently reading 33.2 (Harrop supercharged). I put some Lucas fuel additive every 2-3 fill-ups to keep the fuel system and injectors clean and that keeps it running sweetly. Sent from my Oppo X3 using Tapatalk

Update incase anyone else comes up against this. I've cracked it by using a iDatalink Maestro SW, did have to ship from the US, but from amazon.com it's still quite reasonable. https://www.amazon.com/dp/B00J4W10XG Pretty straightforward to wire up. I used the Connects2 harness and just cut the plug off that would be for their SWC interface. Anyway, works like a charm and is even re-programmable, should you want volume up to map to volume down 😂