What I would do is put in £20 of 99ron drive it round till the light come back on. Then put in another £20 with the the cleaner so it's a nice strong mix with minimal E10 present, drive it round at varied rpm and load till the light comes back on and then fill up as normal.
Only my advice, in the past I've connected a fuel line post filter to a can of forte and was amazed at the amount of crap that came out the tailpipe of my H reg Peugeot 309 1.3 carb engine. It literally smoked out a small railway bridge as in I could see the bridge behind me. The next week went to do the same showing off to my little brother and just a few coughs of smoke came out the back, guess it worked 🤣