Yes, BP is rationing petrol
to it's stations because they have a shortage and distribution problems. Why is this so difficult for you to understand? Why are you imaginging ration books? I can only assume because you suffered rationing in WW2 that you can't comprehend that rationing has any other meaning. Maybe you're just tired and fractious. All that driving can take it out of you, though you may have to cut back if the fuel situation worsens.
Does this help? (See last line - highlighted) -
rationed
Also found in:
Thesaurus,
Medical,
Financial,
Idioms,
Encyclopedia,
Wikipedia.
Related to rationed:
Ration book
ra·tion
(răsh′ən, rā′shən)
n.
1. A fixed portion, especially an amount of food allotted to persons in military service or to civilians in times of scarcity.
2. rations Food issued or available to members of a group.
tr.v. ra·tioned,
ra·tion·ing,
ra·tions
1. To supply with rations.
2.
a. To distribute as rations: rationed out flour and sugar.
b. To restrict to limited allotments, as during wartime: ration gasoline. See Synonyms at distribute.