I just thought it might be a good idea at the time after the o2 sensor problem,thought it may help clean the engine a bit.
It's no big deal, it was only £3.
The reason I use 97 RON is because it's hard to get anything else locally.
The nearest Shell garage is about half an hour away.
The car runs fine (normally) on 97,
As i said if it's rubbish I'll not bother, it's only 3 bangers.