I know it's a bit late, but this had me thinking for the past couple of days.
The petrol stations raised the price in anticipation then dropped prices by 1p after the announcement. The excuse fuel companies gave was that it cannot be passed on straight away because of the way the industry works.
Basically most fuel is pre-bought and held with duty already paid, hence why they cannot pass the new rate on straight away.
What I want to know is that when there is an increase in duty, they pass on the increase straight away, surely the duty should be passed when new 'stock' is bought?
What are your thoughts?