My earliest recollection of petrol prices was when I was sent on my bike to get a gallon of 16:1 for the lawn mower, two half crowns and enough change to knock on the backdoor of the pub for a packet of crisps and still have some change. The petrol pump was hand cranked.
My earliest memory of fuel payment is odd ball really. We only got a car after my father was posted to Germany, soldiers over there were issued with petrol coupons to be used at
BP garages ( also
ESSO on autobahns) so he hardly ever needed money at all.