i dont think it matters where you buy the petrol. it all comes out the north sea and all goes through the same refineries, its only deliveried to different forecourts.
i signed up to a thing years ago where if there were enough members theoretically its like buying the petrol in bulk, but not heard any more about it in years.
i think we should just fill up with petrol and and over no more than £40 no matter how much you put in!
cant take action if everyone done it!