I get Railway Magazine by subscription - Normally delivered Monday before publication
In common with many of your other posts your comments re Petrol are total rubbish.
A friend of mine has recently retired from BP at Hamble which is just down the road. In this area we have the BP Hamble distribution depot and about a mile further is the Esso Fawley refinery ((about 20 miles by road). The two are connected by pipeline. If either has a shortage then a consignment comes down the pipe. Tesco have a superstore about two miles from Hamble which is where their 4* comes from. So, depending if a consignment has just come from Fawley you could be filling up with either BP or Esso!
Go for the lower price or Nectar points!