It's not just cheap 95RON fuel. I've had the crickety fuel pump forever, and the car has been run on V-Power or Momemtum-99 almost exclusively - neither of which are cheap, nor 95RON.
The only time it ever disappeared was when using Esso-97, which apparently how no ethanol. Now that Esso do a 99RON fuel to rival V-Power/Tesco Momentum, and my nearest fuel station is Esso, I've switched to using that. Since then, no crickets.