Nope petrol stations have not been full for a year.....
Refinery storage tanks .... storage being the word have always been filling and always are .... that is why they are called storage tanks or farms
When you pump fuel into your car do you think it just got refined and transported a few days ago? even just last month?
You know a refinery pretty much runs 24 hrs right
But yes maybe so they do not have enough storage so are just pouring all that excess down the drains.....
No matter where you live in the UK you will not be too far from a storage site- go drive past the scale of those farms and compare them to a tanker truck.
and I do not know the total UK storage hold for petrol, diesel, red diesel, and LPG gas
but i bet it is a ******* lot of it